Noun
A ring; a ringlike part or space.
A space contained between the circumferences of two circles, one within the other.
The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.
Ring-shaped structures or markings, found in, or upon, various animals.
Source: Webster's dictionarya ring of ships in the harbor Source: Internet
a halo of smoke Source: Internet
A Laurent series is thus any series of the form : If such a series converges, then in general it does so in an annulus rather than a disc, and possibly some boundary points. Source: Internet
Mushrooms lacking partial veils do not form an annulus. Source: Internet
The resulting violent expulsion of fluid from the annulus is one potential cause or contributor to the "kick". citation (Kicks, which can cause blowouts, typically do not involve hydrates: see Blowout: formation kick ). Source: Internet
The system consists of a circular annulus in the condenser, which produces a cone of light. Source: Internet