||An"nu*lus (&?;), n.; pl. Annuli (&?;). [L.] 1. A ring; a ringlike part or space.
2. (Geom.) (a) A space contained between the circumferences of two circles, one within the other. (b) The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
3. (Zoöl.) Ring-shaped structures or markings, found in, or upon, various animals.
An*nu"mer*ate (&?;), v. t. [L. annumeratus, p. p. of annumerare. See Numerate.] To add on; to count in. [Obs.] Wollaston.
An*nu`mer*a"tion (&?;), n. [L. annumeratio.] Addition to a former number. [Obs.] Sir T. Browne.