endo-

a combining form meaning “within,” used in the formation of compound words:

endocardial.

Also, especially before a vowel, end-.

Origin

< Greek, combining form of éndon within; cognate with Old Irish ind-, OL endo- in, on

British Dictionary definitions for endo-

endo-

combining form

inside; within: endocrine

Word Origin

from Greek, from endon within

Word Origin and History for endo-

word-forming element meaning "inside, within, internal," comb. form of Greek endon "in, within," literally "in the house of," from en "in" (see en- (2)) + base of domos "house" (see domestic).

endo- in Medicine

endo- or end-
pref.
Inside; within: endometrium.

endo- in Science

endo-
A prefix meaning "inside," as in endoskeleton.