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Meaning of annulus

an•nu•lus

Pronunciation: (an'yu-lus), [key]
— pl. -li -lus•es.
  1. a ring; a ringlike part, band, or space.
  2. the space between two concentric circles on a plane.
  3. the veil remnant on a mushroom stalk. See illus. under
  4. a growth ring, as on the cross section of a tree trunk, that can be used to estimate age.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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