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blastula (n.)

embryonic state, 1875, Modern Latin, from Greek blastos "sprout, germ" + diminutive ending -ula (see -ule).

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Definitions of blastula from WordNet

blastula (n.)
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;
Synonyms: blastosphere
From wordnet.princeton.edu