endo-

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

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Collins
World English Dictionary
endo- or (before a vowel) end-
 
combining form
inside; within: endocrine
 
[from Greek, from endon within]
 
end- or (before a vowel) end-
 
combining form
 
[from Greek, from endon within]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

endo-
comb. form of Gk. endon "within," lit. "in the house," from en- "in" + base of domos "house" (see domestic). Used to form scientific compounds in Gk.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
endo-  
A prefix meaning "inside," as in endoskeleton.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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