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• endo-
  endo-

  a combining form meaning “within,” used in the formation of compound words.
• endo–
  endo–

  A prefix meaning “inside,” as in endoskeleton.

endo-

American  

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

   endocardial.

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endo- British  

combining form

1. inside; within

   endocrine

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endo– Scientific  

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

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Etymology

Origin of endo-

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