| var. of endo- before a vowel: endameba. |
| a combining form meaning “within,” used in the formation of compound words: endocardial. |

| end- pref. Variant of endo-. |
| endo- or end- pref. Inside; within: endometrium. [Greek, from endon, within; see en in Indo-European roots.] |
end- pref.
Variant of endo-.
endo- or end-
pref.
Inside; within: endometrium.
| endo-
A prefix meaning "inside," as in endoskeleton. |