Definition of annulus in English:

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Pronunciation: /ˈanyələs/

noun (plural annuli /-ˌlī/)

A ring-shaped object, structure, or region.
Example sentences
  • Channel incorporation was typically achieved within a few minutes after ‘brushing’ the membrane fraction across the annulus with fresh lipids to form a new bilayer.
  • The tympanic annulus must be completely visible.
  • The fibrillar collagens also change across the disc, with the nucleus containing only type II collagen while both types I and type II are found in the annulus.


Mid 16th century: from Latin anulus, annulus.

For editors and proofreaders

Syllabification: an·nu·lus

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