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blasto-

1.
a combining form meaning “bud, sprout,” “embryo,” “formative cells or cell layer,” used in the formation of compound words:
blastosphere.
Also, -blast.
Origin
< Greek, combining form of blastós a bud, sprout
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blasto

blasto-

combining form
1.
(in biology) indicating an embryo or bud or the process of budding: blastoderm
Word Origin
from Greek blastos; see -blast
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 blasto

blasto-

before vowels blast-, word-forming element used in scientific compounds to mean "germ, bud," from Greek blasto-, comb. form of blastos "sprout, germ," of unknown origin.

Online Etymology Dictionary, © 2010 Douglas Harper
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blasto in Medicine

blasto- or blast-
pref.
Bud; germ; budding; germination: blastocyst.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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