nounWord forms: plural ˈblastulas or ˈblastuˌlae (ˈblæstjuˌli
an embryo at the stage
in which it consists of usually one layer of cells around a central cavity, forming
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'blastula'ModL, dim. < Gr blastos, a sprout