epiboly: Meaning and Definition of

e•pib•o•ly

Pronunciation: (i-pib'u-lē), [key]
— pl. -lies.
  1. the 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.