a combining form meaning “bud, sprout,” “embryo,” “formative cells or cell layer,” used in the formation of compound words: blastosphere.
Also especially before a vowel, blast-.
See also -blast.

Origin of blasto-

< Greek, combining form of blastós a bud, sprout Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for blasto-


combining form

(in biology) indicating an embryo or bud or the process of buddingblastoderm

Word Origin for blasto-

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

Medicine definitions for blasto-



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.