- a blastula, especially a blastocyst.
Origin of blastosphere
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for blastosphere
One-half of the blastosphere may be pushed in towards the other half.
The blastosphere determines the orientation of the gastrula, and so forth.
Both the blastosphere and gastrula often swim freely by flagella.The Whence and the Whither of Man
John Mason Tyler
The blastosphere, growing beyond its limits, folds into a cup-shaped organism.
While the ovum itself becomes at the same time a blastosphere.
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