endo-

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

   endocardial.

endo-

combining_form

1. inside; within

   endocrine

endo–

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

Word History and Origins

Origin of endo-¹

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

Word History and Origins

Origin of endo-¹

from Greek, from endon within