Search Result for "blastula":
Wordnet 3.0

NOUN (1)

1. early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs;
[syn: blastula, blastosphere]



The Collaborative International Dictionary of English v.0.48:

Blastula \Blas"tu*la\, n. [NL., dim. of Gr. blasto`s a sprout.]
   (Biol.)
   That stage in the development of the ovum in which the outer
   cells of the morula become more defined and form the
   blastoderm.
   [1913 Webster]