TENU'ITY, n. [L. tenuitas, from tenuis, thin. See Thin.]

1. Thinness, smallness in diameter; exility; thinness, applied to a broad substance, and slenderness, applied to one that is long; as the tenuity of paper or of a leaf; the tenuity of a hair or filament.

2. Rarity; rareness; thinness; as of a fluid; as the tenuity of the air in the higher regions of the atmosphere; the tenuity of the blood.

3. Poverty. [Not in use.]