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blastula

Noun

blas=tu=la

WORDNET DICTIONARY

blastula(n = noun.animal) blastosphere - 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; Array

is a kind of conceptus, embryo, fertilized egg

has parts: blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity, trophoblast

has particulars: blastocyst, blastodermic vessicle

Derived form adjective blastular₁

blastula, n. [NL., dim. of Gr. blasto`s a sprout.].

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]

blastula, n. (pl. blastulae or US blastulas) Biol. an animal embryo at an early stage of development when it is a hollow ball of cells.

Etymology

mod.L f. Gk blastos sprout

For further exploring for "blastula" in Webster Dictionary Online