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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for -plast


n combining form

indicating an organized living cell or particle of living matterprotoplast

Word Origin for -plast

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

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