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

combining form

  1. inside; withinendocrine

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).


  1. Inside; within:endometrium.

  1. A prefix meaning “inside,” as in endoskeleton.

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