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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


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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.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
2012), generating interest among growers in methods to reduce labor requirements for thinning, weeding, irrigating and harvesting (Fennimore et al.
The macroscopic theory of thinning of a liquid film with rigid boundaries was also presented [15].
"Kur" at Horticultural Research Station Bahawalpur (Pakistan) to improve quality fruit parameters of this cultivar by strand thinning. The plants were of 20-year-old uniform in size growth and vigour which were kept under normal schedule of cultural practices.
Tokyo, Feb 15, 2013 - (JCN) - Nippon Paper Industries is participating in forest thinning 'Hokkaido Mori-no-Chonaikai' measures.
To determine the optimal management techniques for these forests, the effects of commonly used management practices (e.g., selective thinning) on ecosystem carbon sinks need to be assessed.
We all know that women's hair generally starts thinning as they get older.
Different base elastomers impart different magnitudes of shear thinning behavior to a given compound.
Long-term monitoring is required to ensure that forest restoration doesn't degenerate into mere forest thinning.
We are looking at thinning that same tube down to a 0.07-mm wall," he adds.
(2004) reported that the agricultural task of plant thinning by adults was associated with higher urinary pesticide metabolite concentrations in children.
Significant portions of a large Antarctic ice shelf just south of one that suddenly broke apart in February 2002 are rapidly thinning and may suffer a similar, catastrophic demise in less than a century, scientists say.