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a combining form meaning “living substance,” “organelle,” “cell,” used in the formation of compound words:
chloroplast; chromoplast; protoplast.
Origin of -plast
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for -plast


combining form
indicating an organized living cell or particle of living matter: protoplast
Word Origin
from Greek plastos formed, from plassein to form
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for -plast

word-forming element denoting "something made," from Greek plastos "formed, molded," verbal adjective from plassein "to mold" (see plasma). Used to form names of small particles of living matter.

Online Etymology Dictionary, © 2010 Douglas Harper
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