- a combining form meaning “earlier,” “before,” “former,” used in the formation of compound words: proterotype.
Also especially before a vowel, proter-.
Origin of protero-
< Greek, combining form representing próteros, comparative formed from pró; see pro-2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- anterior or former in time, place, order, etcproterozoic
from Greek proteros fore
Word Origin and History for protero-
before vowels proter-, word-forming element meaning "former, earlier," from comb. form of Greek proteros "before, former, anterior," from PIE *pro-, from root *per- (1) "forward, through" (see per).
Online Etymology Dictionary, © 2010 Douglas Harper