8 letters · 10 points in Scrabble
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) implantatio
originFrom 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”).
Etymology from Wiktionary, CC BY-SA 3.0