is·let

[ahy-lit]
noun
1.
a very small island.
adjective
2.
Anatomy. situated in or pertaining to the islet of Langerhans: islet cells.

Origin:
1530–40; < Middle French islette. See isle, -et

is·let·ed, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
islet (ˈaɪlɪt) [Click for IPA pronunciation guide]
 
n
a small island
 
[C16: from Old French islette; see isle]

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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00:10
Islet is always a great word to know.
So is facial nerve. Does it mean:
either one of the seventh pair of cranial nerves composed of motor fibers that control muscles of the face except those used in chewing
a pair of the largest nerves in the body that originate in the lower back and extend down to above the knees, where they divide into other nerves
American Heritage
Medical Dictionary

islet is·let (ī'lĭt)
n.
A small island.

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
Many diabetes researchers insist that a cure lies instead in research on stem
  cells and islet cell transplants.
Plans were in store to built a full-service spa on its one islet.
Tumors can also occur in these cells, but they are called islet cell tumors.
Researchers have made progress recently in human-to-human islet cell
  transplantation.
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