annulus

play
noun an·nu·lus \ˈan-yə-ləs\

Definition of annulus

plural

annuli

play \-ˌlī, -(ˌ)lē\ also

annuluses

  1. 1 :  ring

  2. 2 :  a part, structure, or marking resembling a ring: such asa :  a line of cells around a fern sporangium that ruptures the sporangium by contractingb :  a growth ring (as on the scale of a fish) that is used in estimating age

Origin and Etymology of annulus

Medieval Latin, from Latin anulus finger ring, from anus ring — more at anus


First Known Use: 1563


Medical Dictionary

annulus

play
noun an·nu·lus \ˈan-yə-ləs\
variants: also

anulus

Medical Definition of annulus

plural

annuli

\-ˌlī\play also

annuluses

  1. :  a ringlike part, structure, or marking; especially :  any of various ringlike anatomical parts (as the inguinal ring)


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