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a combining form meaning “four,” used in the formation of compound words:
Also, especially before a vowel, tetr-.
Origin of tetra-
< Greek, combining form of téttara, neuter of téttares four Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tetra-


combining form
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-

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-

  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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