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

< Greek, combining form of téttara, neuter of téttares four

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World English Dictionary
tetra- or (before a vowel) tetr-
combining form
four: tetrameter
[from Greek]
tetr- or (before a vowel) tetr-
combining form
[from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "four," from Gk. tetra-, combining form of tettares, tessares "four" (see four).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

tetra- or tetr-

  1. Four: tetradactyl.

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

The American Heritage® Stedman's Medical Dictionary
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