semilunar

[sem-ee-loo-ner, sem-ahy-]
adjective
shaped like a half-moon; crescent.

Origin:
1590–1600; semi- + lunar

presemilunar, adjective
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Collins
World English Dictionary
semilunar (ˌsɛmɪˈluːnə)
 
adj
shaped like a crescent or half-moon

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

semilunar sem·i·lu·nar (sěm'ē-lōō'nər, sěm'ī-) or sem·i·lu·nate (-lōō'nāt')
adj.
Shaped like a half-moon; crescent-shaped; lunar.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Its orifice is guarded by the aortic semilunar valves.
The valve between the left ventricle and the aorta is the aortic semilunar valve.
If the intestine has been inflated and dried, the lips are of a semilunar shape.
Meniscectomy, or excision of semilunar cartilage in a single knee.
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