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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.
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Also especially before a vowel, blast-.
See also -blast.

Origin of blasto-

< Greek, combining form of blastós a bud, sprout
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for blasto-

blasto-

combining form
  1. (in biology) indicating an embryo or bud or the process of buddingblastoderm
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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

Word Origin and History for 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.

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Online Etymology Dictionary, © 2010 Douglas Harper

blasto- in Medicine

blasto-

pref.
  1. Bud; germ; budding; germination:blastocyst.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.