[ te-truh ]
/ ˈtɛ trə /


any of several tropical, freshwater fishes of the family Characidae, often kept in aquariums.

Origin of tetra

1930–35; shortening of New Latin Tetragonopterus former genus name. See tetragon, -o-, -pterous

Definition for tetra (2 of 2)


a combining form meaning “four,” used in the formation of compound words: tetrabranchiate.
Also especially before a vowel, tetr-.

Origin of tetra-

< Greek, combining form of téttara, neuter of téttares four
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for tetra

British Dictionary definitions for tetra (1 of 2)

/ (ˈtɛtrə) /

noun plural -ra or -ras

any of various brightly coloured tropical freshwater fishes of the genus Hemigrammus and related genera: family Characidae (characins)

Word Origin for tetra

C20: short for New Latin tetragonopterus (former genus name), from tetragon + -o- + -pterous, from Greek pteron wing

British Dictionary definitions for tetra (2 of 2)


before a vowel tetr-

combining form


Word Origin for tetra-

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

Medical definitions for tetra



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.