annulus
noun
an·nu·lus
ˈan-yə-ləs
plural annuli
ˈan-yə-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
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Merriam-Webster unabridged
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