a prefix occurring in loanwords from Greek, where it meant “upon,” “on,” “over,” “near,” “at,” “before,” “after” (epicedium; epidermis; epigene; epitome); on this model, used in the formation of new compound words (epicardium; epinephrine).
on; upon; above; over: epidermis, epicentre
in addition to: epiphenomenon
after: epigenesis, epilogue
near; close to: epicalyx
word-forming element meaning “on, upon, above,” also “in addition to; toward, among,” from Greek epi “upon, at, close upon (in space or time), on the occasion of, in addition,” from PIE *epi, *opi “near, at, against” (cf. Sanskrit api “also, besides;” Avestan aipi “also, to, toward;” Armenian ev “also, and;” Latin ob “toward, against, in the way of;” Oscan op, Greek opi- “behind;” Hittite appizzis “younger;” Lithuanian ap- “about, near;” Old Church Slavonic ob “on”). Before unaspirated vowels, reduced to ep-; before aspirated vowels, eph-. A productive prefix in Greek; also used in modern scientific compounds (e.g. epicenter).
epi- or ep-
[ep-uh-ben-thos] /ˌɛp əˈbɛn θɒs/ noun, Biology. 1. the aggregate of organisms living on the sea bottom between low tide and 100 fathoms (180 meters).
/ˌɛpɪbaɪˈəʊsɪs/ noun 1. any relationship between two organisms in which one grows on the other but is not parasitic on it See also epiphyte, epizoite
[ep-uh-bahy-ot-ik] /ˌɛp ə baɪˈɒt ɪk/ Biology adjective 1. of or relating to an organism that lives, usually parasitically, both on the surface and within the body of its host. noun 2. any such organism, as certain fungi.
[ep-uh-blast] /ˈɛp əˌblæst/ noun, Embryology. 1. the primordial outer layer of a young embryo before the segregation of the germ layers, capable of becoming the ectoderm and containing cells capable of becoming the mesoderm and endoderm. /ˈɛpɪˌblæst/ noun 1. (embryol) the outermost layer of an embryo, which becomes the ectoderm at gastrulation Also called ectoblast […]
/ˈɛpɪˌblɛm/ noun 1. (botany) the outermost cell layer of a root; epidermis