WordReference Random House Unabridged Dictionary of American English © 2026
e•pib•o•ly
(i pib′ə lē),USA pronunciation n., pl. -lies. [Embryol.]
ep•i•bol•ic
(ep′ə bol′ik),USA pronunciation adj.
- Developmental Biologythe movement and spreading out of cells into sheets of tissue that overlie or surround other groups of cells, esp. as in the formation of certain gastrulas.
- Greek epibolé̄ a throwing on, equivalent. to epi- epi- + bol- (variant stem of bállein to throw) + -ē noun, nominal suffix
- 1870–75;