blas·to·cyst (bl s t -s st )n. The modified blastula that is characteristic of placental mammals. Also called blastodermic vesicle. blas to·cystic adj. |
blastocyst [ˈblæstəʊˌsɪst]
n Embryol
1. (Life Sciences & Allied Applications / Biology) Also called blastosphere the blastula of mammals: a sphere of cells (trophoblast) enclosing an inner mass of cells and a fluid-filled cavity (blastocoel)
2. (Life Sciences & Allied Applications / Biology) another name for germinal vesicle
| blastocyst (blst-sst) The modified blastula that is characteristic of placental mammals. It has an outer layer, known as a trophoblast, that participates in the development of the placenta. The inner layer of cells develops into the embryo. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | blastocyst - the blastula of a placental mammal in which some differentiation of cells has occurred blastosphere, blastula - 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 |
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