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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.
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References in periodicals archive ?
In crucian carp (Carassius auratus Linnaeus 1758), HHP shock administered to inseminated eggs disrupted the proper formation of blastodiscs, impaired the development of cytoplasm, and triggered the delay of epiboly and suppression of the dorsoventral differentiation [9].
Upon passage of eight hours, a gastrula was formed and its epiboly started to extend toward the vegetal pole (Fig.
At 12th hour after the fertilization; normal embryo development was observed in diploid gynogen (41.4[degrees]C shock applied) and control group (bud-stage), however, haploid embryos showed slower development than them, that is; in 8-hour stage (75% epiboly).
Crucian carp (Carassius auratus Linnaeus 1758) eggs subjected to the hydrostatic pressure shock exhibited impaired embryonic development, including, for example, a delay of epiboly and suppression of the dorsoventral differentiation [36].
The early gastrula was observed 02 h 40 min AF (Figure 1a), and the 100% epiboly stage was observed 05 h 10 min AF (Figure 1g).
Regulation of cell polarity, radial intercalation, an epiboly in Xenopus: novel roles for integrin and fibronectin.
For each experiment 20 fertilized eggs at the beginning of the epiboly stage (4 hours) were used.
Also, the term epiboly means that the growth of one dimension of human life (e.g., culture, knowledge, faith, education and etc.) overlies on other parts as the fermentation of certain energetic processing of psychometric characteristics of existence.
Ten embryonic stages (egg, 16 cells, high, sphere, 30% epiboly, 2-somite, 21-somite, 27-somite, hatching and 1 day after hatching, DAH) were selected at the time before eye migration.
1), but gastrulation is by epiboly in the two species of Capitella.
"Our results show that FAK has a critical role in morphogenesis and its activity is required for a specific morphogenetic movement called epiboly. Defects in epibloy lead to arrest of gastrulation, severe morphological and tissue positioning abnormalities and embryonic death," he said.