Te*nu"i*ty (?), n. [L. tenuitas, from tenuis thin: cf. F. t'enuit'e. See Tenuous.]
The quality or state of being tenuous; thinness, applied to a broad substance; slenderness, applied to anything that is long; as, the tenuity of a leaf; the tenuity of a hair.
Rarily; rareness; thinness, as of a fluid; as, the tenuity of the air; the tenuity of the blood.
© Webster 1913.