/ Dictionary / Index B blastula: Meaning and Definition of Find definitions for: blas•tu•la Pronunciation: (blas'chu-lu), [key] — pl. -las, -lae the early developmental stage of an animal, following the morula stage and consisting of a single, spherical layer of cells enclosing a hollow, central cavity. Cf. blastocyst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blastula (Thesaurus) blastostyle blast wave Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language