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trifid

[trahy-fid] /ˈtraɪ fɪd/
adjective
1.
cleft into three parts or lobes.
Origin
1745-1755
1745-55; < Latin trifidus split in three. See tri-, -fid
Related forms
subtrifid, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for trifid

trifid

/ˈtraɪfɪd/
adjective
1.
divided or split into three parts or lobes
Word Origin
C18: from Latin trifidus from tri- + findere to split
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for trifid
adj.

"divided into three lobes," 1620s, from Latin trifidus "cleft in three," from tri- "three" (see tri-) + -fid. This adjective probably inspired triffid, the name of the three-legged walking poisonous plants in John Wyndham's novel "The Day of the Triffids" (1951).

Online Etymology Dictionary, © 2010 Douglas Harper
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trifid in Medicine

trifid tri·fid (trī'fĭd')
adj.
Divided into three narrow parts or lobes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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10
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