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adj. thin·ner, thin·nest
a. Relatively small in extent from one surface to the opposite, usually in the smallest solid dimension: a thin book.
b. Not great in diameter or cross section; fine: thin wire.
2. Having little bodily flesh or fat; lean or slender.
a. Not dense or concentrated; sparse: the thin vegetation of the plateau.
b. More rarefied than normal: thin air.
a. Flowing with relative ease; not viscous: a thin oil.
b. Watery: thin soup.
a. Sparsely supplied or provided; scanty: a thin menu.
b. Having a low number of transactions: thin trading in the stock market.
6. Lacking force or substance; flimsy: a thin attempt.
7. Lacking resonance or fullness; tinny: The piano had a thin sound.
8. Lacking radiance or intensity: thin light.
9. Not having enough photographic density or contrast to make satisfactory prints. Used of a negative.
1. In a thin manner: Spread the varnish thin if you don't want it to wrinkle.
2. So as to be thin: Cut the cheese thin.
tr. & intr.v. thinned, thin·ning, thins
To make or become thin or thinner.

[Middle English, from Old English thynne; see ten- in Indo-European roots.]

thin′ly adv.
thin′ness n.
thin′nish adj.


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1. Reducing the number of seedlings in a row so that they are spaced correctly.
2. The pruning out of selected stems to improve air circulation and vigor.
3. The removal of excessive developing fruits to improve the quality of those that remain.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.thinning - the act of diluting something; "the cutting of whiskey with water"; "the thinning of paint with turpentine"
dilution - weakening (reducing the concentration) by the addition of water or a thinner
References in classic literature ?
There was a rude board coffin on a cart at the door, and workmen, assisted by the police, were thinning a road through the gaping crowd in order that they might bring it in.
There was still some gold in the thinning hair and some scarlet on the sensual mouth.
Then the Isosceles classes, asserting that the Specimens were no longer used nor needed, and refusing to pay the customary tribute from the Criminal classes to the service of Education, waxed daily more numerous and more insolent on the strength of their immunity from the old burden which had formerly exercised the twofold wholesome effect of at once taming their brutal nature and thinning their excessive numbers.