annulus

noun an·nu·lus \ ˈan-yə-ləs \

Definition of annulus

plural annuli play \-ˌlī, -(ˌ)lē\ also annuluses
1 :ring
2 :a part, structure, or marking resembling a ring: such as
a :a line of cells around a fern sporangium that ruptures the sporangium by contracting
b :a growth ring (as on the scale of a fish) that is used in estimating age

Recent Examples of annulus from the Web

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Origin and Etymology of annulus

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


Medical Dictionary

annulus

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

medical Definition of annulus

plural annuli play \-ˌlī\ also annuluses
:a ringlike part, structure, or marking; especially :any of various ringlike anatomical parts (as the inguinal ring)

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