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The growth of a rapidly dividing group of cells around a more slowly dividing group of cells, as in the formation of a gastrula.

[Greek epibolē, a throwing or laying on, from epiballein, to throw on : epi-, epi- + ballein, to throw; see gwelə- in Indo-European roots.]

ep′i·bol′ic (ĕp′ə-bŏl′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -lies
(Zoology) 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]
epibolic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪˈpɪb ə li)

n., pl. -lies.
the movement of a group of cells over a more slowly dividing group, resulting in an outer and inner layer, as in a gastrula.
[1870–75; < Greek epibolḗ the act of throwing or laying on, n. derivative of epibállein to throw upon, lay on = epi- epi- + bállein to throw]
ep•i•bol•ic (ˌɛp əˈbɒl ɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


the growth of part of an organism in such a way that it overlays or surrounds another. — epibolic, adj.
See also: Growth
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.