Medical Dictionary

annulus an·nu·lus or an·u·lus (ān'yə-ləs)
n. pl. an·nu·lus·es or an·nu·li (-lī')
A circular or ring-shaped structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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