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protero-

1.
a combining form meaning “earlier,” “before,” “former,” used in the formation of compound words:
proterotype.
Also, especially before a vowel, proter-.
Compare proto-.
Origin
< Greek, combining form representing próteros, comparative formed from pró; see pro-2
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for protero

protero-

combining form
1.
anterior or former in time, place, order, etc: proterozoic
Word Origin
from Greek proteros fore
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for protero

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
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