• WordNet 3.6
    • v harrow draw a harrow over (land)
    • n harrow a cultivator that pulverizes or smooths the soil
    • ***
Webster's Revised Unabridged Dictionary
    • Harrow An implement of agriculture, usually formed of pieces of timber or metal crossing each other, and set with iron or wooden teeth. It is drawn over plowed land to level it and break the clods, to stir the soil and make it fine, or to cover seed when sown.
    • Harrow (Mil) An obstacle formed by turning an ordinary harrow upside down, the frame being buried.
    • interj Harrow Help! Halloo! An exclamation of distress; a call for succor; -- the ancient Norman hue and cry. "Harrow and well away!""Harrow ! alas! here lies my fellow slain."
    • Harrow To break or tear, as with a harrow; to wound; to lacerate; to torment or distress; to vex. "My aged muscles harrowed up with whips.""I could a tale unfold, whose lightest word
      Would harrow up thy soul."
    • Harrow To draw a harrow over, as for the purpose of breaking clods and leveling the surface, or for covering seed; as, to harrow land. "Will he harrow the valleys after thee?"
    • v. t Harrow To pillage; to harry; to oppress. "Meaning thereby to harrow his people."
    • ***
Century Dictionary and Cyclopedia
    • n harrow An implement, usually formed of pieces of timber or bars of metal crossing one another and set with iron teeth (also called tines), drawn (usually by one corner) over plowed land to level it and break the clods, and to Cover Seed when sown. A similar implement is drawn by a boat or vessel over oyster-beds to clear them of marine plants and objectionable substances.
    • harrow To draw a harrow over; break or tear with a harrow: as, to harrow land or ground.
    • harrow To tear or lacerate as if by a harrow; torment; harass.
    • harrow To ravage; despoil; vex: same as harry.
    • harrow Help! hallo! hello! an exclamation of sudden distress, of lamentation, or of indignation or surprise: used by heralds to attract attention.
    • n harrow Disturbance; cry; uproar.
    • n harrow A barrow-like military formation; also, that assumed by flying flocks of wild geese.
    • ***
Chambers's Twentieth Century Dictionary
    • n Harrow har′ō a frame of wood or iron toothed with spikes for smoothing and pulverising ploughed land, and for covering seeds sown
    • v.t Harrow to draw a harrow over: to harass: to tear
    • Harrow . See Haro.
    • Harrow (Spens.) a mere exclamation of distress
    • ***


Webster's Revised Unabridged Dictionary
OE. harowe, harwe, AS. hearge,; cf. D. hark, rake, G. harke, Icel. herfi, harrow, Dan. harve, Sw. harf,. √16


In literature:

But Harrow knew nothing of Froebel methods, and does not yet.
"Little Journeys to the Homes of the Great, Volume 5 (of 14)" by Elbert Hubbard
Saxo hurries over this harrowing episode.
"The Sunny Side of Diplomatic Life, 1875-1912" by Lillie DeHegermann-Lindencrone
So harrowing is his psychology that the ordinary methods of punctuation are quite inadequate to convey it.
"Reviews" by Oscar Wilde
So after the man has plowed the ground he will harrow it.
"Daddy Takes Us to the Garden" by Howard R. Garis
With the first fall of the rains the lands are ploughed and harrowed.
"The Commercial Products of the Vegetable Kingdom" by P. L. Simmonds
Better far than The Bandit of Harrowing Highway!
"Pee-wee Harris on the Trail" by Percy Keese Fitzhugh
Strategically it has the shape of an immense harrow.
"Notable Events of the Nineteenth Century" by Various
Many a harrowing thought and remembrance passed through his mind, as his eye traced its dim outline in the fading-light'.
"Phelim O'toole's Courtship and Other Stories Traits And Stories Of The Irish Peasantry, The Works of William Carleton, Volume Three" by William Carleton
In July, 1851, Montagu Butler left Harrow, and in the following October entered Trinity College, Cambridge, as a Scholar.
"Prime Ministers and Some Others" by George W. E. Russell
The new team will do the trucking about and the regular farm work, while the other three are kept steadily at the ploughs and harrows.
"The Fat of the Land" by John Williams Streeter
Harrow, the, and harrowing, 17, 65, 84, 125, 135, 141, 153-4, 166, 176, 176, 179, 194, 201, 203, 246.
"A Short History of English Agriculture" by W. H. R. Curtler
There are some men, Harrow, who find rest simply in changing the brain's occupation.
"Destiny" by Charles Neville Buck
I knew nothing of her illness, being at Harrow and in the country, till she was gone.
"Life of Lord Byron, Vol. I. (of VI.)" by Thomas Moore
If very much top growth has been made, a harrow run before the plow will facilitate the thorough covering of the tops.
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
After that, the horse came again with a harrow, to cover the seed over with soil, and it was left to grow.
"Chambers's Elementary Science Readers" by Various
Then harrow it, and if the harrow pulls the manure into heaps, spread them and harrow again.
"Talks on Manures" by Joseph Harris
There were still a good number of animal-drawn plows and harrows in use, however.
"Uller Uprising" by Henry Beam Piper, John D. Clark and John F. Carr
Educated at Harrow and in Germany, he entered the Royal Horse Guards in 1859.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4" by Various
No preacher has done his work thoroughly who does not use the harrow.
"Broken Bread from an Evangelist's Wallet" by Thomas Champness
Then came an interval of harrowing suspense.
"Traditions of Lancashire, Volume 2 (of 2)" by John Roby

In poetry:

O harrowing sight to behold
That marble-like face all cold,
That small cherish'd form
To be flung to the worm, Deep in the charnel-mould!
"The Mother's Lament" by Martin Farquhar Tupper
And with harrows men harrowed us, and subdued with spears,
And crushed with shame;
And the summer and winter was, and the length of years,
And no change came.
"Super Flumina Babylonis" by Algernon Charles Swinburne
In vain to plant, in vain to sow,
In vain to harrow well the levell'd plain,
If thou wilt not command the seed to grow,
And shed thy blessing on the bury'd grain.
"The Farmer's Prayer" by Rees Prichard
My sister a bruised infant's utterance had;
And issuing stronger, to mankind 'twas mad.
I knew my home where I had choice to feel
The toad beneath a harrow or a heel.
"Foresight And Patience" by George Meredith
"O these years of sin and sorrow!
Smiling while the iron harrow
Of a keen and biting longing
Tears and quivers in the marrow
Of my being every moment--
Of my very inmost being.
"Byron And The Angel" by Hanford Lennox Gordon
But regarding the barque "Nor," to her I must return,
And, no doubt, for the drowned men, many will mourn;
Because the crew's sufferings must have been great,
Which, certainly, is soul-harrowing to relate.
"The Collision in the English Channel" by William Topaz McGonagall

In news:

NEW YORK (AP) — Evoking harrowing memories of Hurricane Katrina, 300 patients were evacuated floor by floor from a premier hospital that lost generator power at the height of superstorm Sandy.
NEW YORK — Evoking harrowing memories of Hurricane Katrina, nearly 300 patients were evacuated floor by floor from a premier hospital that lost generator power at the height of superstorm Sandy.
Sandy Prompts Harrowing NYC Hospital Evacuation.
Lone survivor of Craigslist attacks tells harrowing tale at Ohio teenager's murder trial.
Bieber's mom tells her harrowing story (with video).
'The Master' review: Joaquin Phoenix, Philip Seymour Hoffman give powerful performances in harrowing drama.
Pole Creek hikers recount suddenly harrowing outing.
A Buffalo man was arrested Monday after leading authorities on a harrowing chase that ended shortly after a multi-vehicle crash in Sandy Creek, according to Oswego County sheriff's deputies.
Swedish cyclist's helmet tells a harrowing tale.
Author and columnist overcomes harrowing summer illness.
Survivor's video shows harrowing Idaho plane crash.
A harrowing experience brings back memories.
If you step atop a spring-tooth harrow, you can feel a little bounce.
'Bent' goes from hung over to harrowing .
Jihad Jane's sister: Our harrowing childhood (Reuters Exclusive).

In science:

Harrow and Low established, in particular, the equivalence between approximate 2designs and random quantum circuits as introduced in, and conjectured that a random circuit consisting of k=poly(n, t) gates from a two-qubit universal gate set yields an approximate t-design .
Convergence rates for arbitrary statistical moments of random quantum circuits
We thank Aram Harrow for encouraging comments, and Roberto I.
Comment on the paper "Random Quantum Circuits are Approximate 2-designs"
I am greatly indebted to my supervisor Aram Harrow for his teaching, support and inspiration throughout my PhD and for this I greatly thank him. I would also like to thank the whole quantum information group at Bristol and members of the Computer Science department for their support and help.
Pseudo-randomness and Learning in Quantum Computation
It has been pointed out by Harrow that one can prove a number of interesting results in quantum information based on this philosophy .
Weak multiplicativity for random quantum channels
The following example, communicated to us by Aram Harrow, provides deterministic withoutreplacement orderings that have exponentially larger norm than the with-replacement expectation.
Beneath the valley of the noncommutative arithmetic-geometric mean inequality: conjectures, case-studies, and consequences
The authors would like to thank Dimitri Bertsekas, Aram Harrow, Pablo Parrilo for many helpful conversations and suggestions.
Beneath the valley of the noncommutative arithmetic-geometric mean inequality: conjectures, case-studies, and consequences
See, for example, Harrow, Recht and Chuang .) We are dealing here with essential instances of the deep problem of derandomization.
Martin-Lof randomness, invariant measures and countable homogeneous structurs
Harrow, “Efficient Quantum Circuits for Schur and Clebsch-Gordan Transforms”, Phys.
Quantum Algorithms
It is known, that the class of harrow shaped functions and the class of functions of discrete variables are isomorphic.
The Discrete Analogue of the Operator $d^{2m}/dx^{2m}$ and its Properties
According to definition of harrow shaped functions from (34) we get the statement of property 1.
The Discrete Analogue of the Operator $d^{2m}/dx^{2m}$ and its Properties
Recently, Bravyi, Hassidim, and Harrow showed that if Pf and Pg are both unknown (i.e., given by oracles f and g ), then this testing can be done in roughly √m quantum queries to the functions.
New Results on Quantum Property Testing
Allowing quantum queries for accessing distributions, Bravyi, Hassidim, and Harrow recently showed that the L1 -distance between two unknown distributions can actually be estimated up to small error with only O(√m) queries.
New Results on Quantum Property Testing
As Bravyi, Hassidim, and Harrow also independently observed, such a lower bound can be derived from known lower bounds for the collision problem.
New Results on Quantum Property Testing
I thank Professors Dave Bacon and Aram Harrow for feedback and many useful discussions.
Quantum Algorithms for Tree Isomorphism and State Symmetrization

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