-plast

-plast

a combining form meaning “living substance,” “organelle,” “cell,” used in the formation of compound words: chloroplast; chromoplast; protoplast.

Origin:
combining form representing Greek plastós formed, molded, equivalent to plath-, base of plássein to form, mold + -tos verbal adjective suffix, with tht > st. See plastic

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-plast
 
n combining form
indicating an organized living cell or particle of living matter: protoplast
 
[from Greek plastos formed, from plassein to form]

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

-plast
comb. form denoting "something made," from Gk. plastos "formed, molded," from plassein "to mold" (see plasma).
Online Etymology Dictionary, © 2010 Douglas Harper
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