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
British Dictionary definitions for tetra-

tetra-

combining form
1.
four: tetrameter
Word Origin
from Greek
Word Origin and History for tetra-

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

tetra- in Medicine

tetra- or tetr-
pref.

  1. Four: tetradactyl.

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