THIN, a. [L. tenuis; Gr. narrow.] 1. Having little thickness or extent from one surface to the opposite; as a thin plate of metal; thin paper; a thin board; a thin covering.2. Rare; not dense; applied to fluids or to soft mixtures; as thin blood; thin milk; thin air. In the day, when the air is more thin.3. Not close; not crowded; not filling the space; not having the individuals that compose the thing in a close or compact state; as, the trees of a forest are thin; the corn or grass is thin. A thin audience in church is not uncommon. Important legislative business should not be transacted in a thin house.4. Not full or well grown. Seven thin ears. Gen.41.5. Slim; small; slender; lean. A person becomes thin by disease. Some animals are naturally thin.6. Exile; small; fine; not full. Thin hollow sounds, and lamentable screams.7. Not thick or close; of a loose texture; not impervious to the sight; as a thin vail.8. Not crowded or well stocked; not abounding. Ferrara is very large, but extremely thin of people.9. Slight; not sufficient for a covering; as a thin disguise.THIN, adv. Not thickly or closely; in a scattered state; as seed sown thin. Spain is thin sown as people.THIN, v.t. [L. tenuo. See Attenuate.] 1. To make thin; to make rare or less thick; to attenuate; as, to thin the blood.2. To make less close, crowded or numerous; as, to thin the ranks of an enemy; to thin the trees or shrubs of a thicket.3. To attenuate; to rarefy; to make less dense; as, to thin the air; to thin the vapors.
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