Blastula
noun
noun ·Rare ·Advanced level
Definitions
Noun
- 1 An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.
- 2 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 wordnet
Etymology
From New Latin blastula, diminutive of Ancient Greek βλαστός (blastós, “a germ, bud, sprout, shoot”), from βλαστάνω (blastánō, “to bud, sprout, grow, properly of plants, but also of animals”).
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.