a combining form meaning “bud, sprout,” “embryo,” “formative cells or cell layer,” used in the formation of compound words: blastosphere.

Nearby words

  1. blastematic,
  2. blastemic,
  3. blasting,
  4. blasting gelatin,
  5. blasting powder,
  6. blastochyle,
  7. blastocoel,
  8. blastocyst,
  9. blastocyte,
  10. blastocytoma

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

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.

Online Etymology Dictionary, © 2010 Douglas Harper

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.