annulus

annulus definition - medical

an·nu·lus or an·u·lus (ănˈyə-ləs)

noun pl. an·nu·lus·es or an·nu·li (-līˌ)
A circular or ring-shaped structure.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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