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tetra

[te-truh] /ˈtɛ trə/
noun
1.
any of several tropical, freshwater fishes of the family Characidae, often kept in aquariums.
Origin
1930-1935
1930-35; shortening of Neo-Latin Tetragonopterus former genus name. See tetragon, -o-, -pterous

tetra-

1.
a combining form meaning “four,” used in the formation of compound words:
tetrabranchiate.
Also, especially before a vowel, tetr-.
Origin
< Greek, combining form of téttara, neuter of téttares four
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for tetra
  • They compared the genes with those of tetra populations that lived out in the light.
British Dictionary definitions for tetra

tetra

/ˈtɛtrə/
noun (pl) -ra, -ras
1.
any of various brightly coloured tropical freshwater fishes of the genus Hemigrammus and related genera: family Characidae (characins)
Word Origin
C20: short for New Latin tetragonopterus (former genus name), from tetragon + -o- + -pterous, from Greek pteron wing

tetra-

combining form
1.
four: tetrameter
Word Origin
from Greek
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 tetra

tetra-

word-forming element meaning "four," from Greek tetra-, combining form of tettares, tessares "four" (see four).

Online Etymology Dictionary, © 2010 Douglas Harper
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tetra in Medicine

tetra- or tetr-
pref.

  1. Four: tetradactyl.

  2. Composed of or containing four atoms, molecules, or groups: tetrasaccharide.

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