annulus
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2 ENTRIES FOUND:

an·nu·lus

noun \ˈan-yə-ləs\
plural an·nu·li\-ˌlī, -(ˌ)lē\ also an·nu·lus·es

Definition of ANNULUS

1
: ring
2
: a part, structure, or marking resembling a ring: 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

Origin of ANNULUS

Medieval Latin, from Latin anulus finger ring, from anus ring — more at anus
First Known Use: 1563

an·nu·lus

noun \ˈan-yə-ləs\   (Medical Dictionary)
plural ; an·nu·li \-ˌlī\ (audio pronunciation)also ; an·nu·lus·es

Medical Definition of ANNULUS

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

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