thin

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Relatively small in extent from one surface to the opposite, usually in the smallest solid dimension: a thin book.
2. adj. Not great in diameter or cross section; fine: thin wire.
3. adj. Lean or slender in form, build, or stature.
4. adj. Not dense or concentrated; sparse: the thin vegetation of the plateau.
5. adj. More rarefied than normal: thin air.
6. adj. Flowing with relative ease; not viscous: a thin oil.
7. adj. Watery: thin soup.
8. adj. Sparsely supplied or provided; scanty: a thin menu; thin trading.
9. adj. Lacking force or substance; flimsy: a thin attempt.
10. adj. Lacking resonance or fullness; tinny: The piano had a thin sound.
11. adj. Lacking radiance or intensity: thin light.
12. adj. Not having enough photographic density or contrast to make satisfactory prints. Used of a negative.
13. adv. In a thin manner: Spread the varnish thin if you don't want it to wrinkle.
14. adv. So as to be thin: Cut the cheese thin.
15. v. To make or become thin or thinner.

Century Dictionary and Cyclopedia

1. 14. In art, characterized, in composition, by few and widely separated elements, by absence of serious interest, or by lack of body and force in technique.
2. Very narrow in all diameters; slender; slim; long and fine: as, a thin wire; a thin string.
3. Very narrow in one diameter; having the opposite surfaces very near together; having little thickness or depth; not thick; not heavy: as, thin paper; thin boards: opposed to thick.
4. Having the constituent parts loose or sparse in arrangement; lacking density, compactness, or luxuriance; rare; specifically, of the air and other gases, rarefied.
5. Hence, easily seen through; transparent, literally or figuratively; shallow; flimsy; slight: as, a thin disguise.
6. Having slight consistency or viscosity: said of liquids: as, thin syrup; thin gruel.
7. Deficient in some characteristic or important ingredient; lacking strength or richness; specifically, of liquors, small: opposed to strong.
8. Of sound, lacking in fullness; faint, and often somewhat shrill or metallic in tone.
9. Limited in power or capacity; feeble; weak.
10. Meager; lean; spare; not plump or fat.
11. Limited in quantity or number; small or infrequent; scanty.
12. Scantily occupied or furnished; bare; empty: used absolutely or with of.
13. Having no depth: said of a school of fish.
14. Having insufficient density or contrast to give a good photographic print or a satisfactory image on the screen; weak: said of a negative or a lantern-slide.
15. Thinly.
16. To make thin. To attenuate; draw or spread out thin; hence, to reduce in thickness or depth: as, to thin a board by planing.
17. To make less dense or compact; make sparse; specifically, to rarefy, as a gas.
18. To reduce in consistency or viscosity: said of liquids: as, to thin starch.
19. To reduce in strength or richness: as, to thin the blood.
20. To make lean or spare.
21. To reduce in numbers or frequency.
22. To make bare or empty.
23. To become thin. To diminish in thickness; grow or become thin: with out, away, etc.: thus geological strata are said to thin out when they gradually diminish in thickness till they disappear.
24. A Middle English form of thine.

Wiktionary

1. adj. Having little thickness or extent from one surface to its opposite.
2. adj. Very narrow in all diameters; having a cross section that is small in all directions.
3. adj. Having little body fat or flesh; slim; slender; lean; gaunt.
4. adj. Of low viscosity or low specific gravity, e.g., as is water compared to honey.
5. adj. Scarce.
6. adj. golf Describing a poorly played golf shot where the ball is struck by the bottom part of the club head. See fat, shank, toe.
7. n. philately A loss or tearing of paper from the back of a stamp, although not sufficient to create a complete hole.
8. v. transitive To make thin or thinner.
9. v. intransitive To become thin or thinner.
10. v. To dilute.
11. v. To remove some plants in order to improve the growth of those remaining.

GNU Webster's 1913

1. adj. Having little thickness or extent from one surface to its opposite
2. adj. Rare; not dense or thick; -- applied to fluids or soft mixtures.
3. adj. Not close; not crowded; not filling the space; not having the individuals of which the thing is composed in a close or compact state; hence, not abundant
4. adj. Not full or well grown; wanting in plumpness.
5. adj. Not stout; slim; slender; lean; gaunt.
6. adj. Wanting in body or volume; small; feeble; not full.
7. adj. Slight; small; slender; flimsy; wanting substance or depth or force; superficial; inadequate; not sufficient for a covering.
8. adv. Not thickly or closely; in a seattered state.
9. v. To make thin (in any of the senses of the adjective).
10. v. To grow or become thin; -- used with some adverbs, as out, away, etc..

WordNet 3.0

1. v. lessen the strength or flavor of a solution or mixture
2. adj. not dense
3. v. lose thickness; become thin or thinner
4. adj. lacking excess flesh
5. adj. (of sound) lacking resonance or volume
6. adj. very narrow
7. adv. without viscosity
8. v. take off weight
9. adj. lacking spirit or sincere effort
10. v. make thin or thinner
11. adj. lacking substance or significance
12. adj. of relatively small extent from one surface to the opposite or in cross section
13. adj. relatively thin in consistency or low in density; not viscous