blastula, blastosphere
(noun) 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
Source: WordNet® 3.1
blastulae
plural of blastula
Source: Wiktionary
Blas"tu*la, n. Etym: [NL., dim. of Gr. a sprout.] (Biol.)
Definition: That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.
Source: Webster’s Unabridged Dictionary 1913 Edition
24 February 2025
(noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun)
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