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Definition of annulus
annuli
play \-ˌlī, -(ˌ)lē\ alsoannuluses
1 : ring
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
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Recent Examples of annulus from the Web
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Instead, for a few minutes the sun looks like a striking annulus, or ring, which is why an annular eclipse is also often called a ring of fire.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'annulus'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of annulus
Medieval Latin, from Latin anulus finger ring, from anus ring — more at anus
Medical Dictionary
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