a crescent.
Fortification. an outwork resembling a bastion with a crescent-shaped gorge.
a crescent or half-moon shape, as of the top of a piece of furniture.
shaped like a crescent.

1720–30; < French: half moon. See demi-, lune1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
demilune (ˈdɛmɪˌluːn, -ˌljuːn)
1.  fortifications an outwork in front of a fort, shaped like a crescent moon
2.  a crescent-shaped object or formation; half-moon
[C18: from French, literally: 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

demilune dem·i·lune (děm'ē-lōōn')
A small body shaped like a half-moon or crescent, such as one of the crescent-shaped cells surrounding certain mucous glands.

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
Most of the changes occurred in the demilune outside the main fort, with
  planned changes for the main fort being abandoned.
Do not climb on the historic cannons in the fort or walk on the mounds in the
Feel free to explore the tunnels inside the demilune.
The completed fort is a five sided, one-story masonry structure and demilune
  enclosed by a wet moat.
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