noun
also epib·o·le ə̇ˈpibəlē, eˈ-
( plural epibolies also epiboles )
Etymology: Greek epibolē act of throwing or laying on, something thrown or laid on, from epiballein to throw on, from epi- + ballein to throw
: the growing of one part about another during embryogenesis, such growth of the dorsal lip area being one of the fundamental movements of gastrulation — compare invagination , involution