noun, plural epibolies. Embryology.
the movement and spreading out of cells into sheets of tissue that overlie or surround other groups of cells, especially as in the formation of certain gastrulas.

1870–75; < Greek epibolḗ a throwing on, equivalent to epi- epi- + bol- (variant stem of bállein to throw) + noun suffix

epibolic [ep-uh-bol-ik] , adjective
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World English Dictionary
epiboly (ɪˈpɪbəlɪ)
n , pl -lies
embryol a process that occurs during gastrulation in vertebrates, in which cells on one side of the blastula grow over and surround the remaining cells and yolk and eventually form the ectoderm
[C19: from Greek epibolē a laying on, from epiballein to throw on, from epi- + ballein to throw]

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Medical Dictionary

epiboly e·pib·o·ly (ĭ-pĭb'ə-lē)
The growth of a rapidly dividing group of cells around a more slowly dividing group of cells, as in the formation of a gastrula.

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