endo-

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Related to endo-: endocarditis, dictionary

endo-

(word root) within

Examples of words with the root endo-: endoscopy, endocardial

endo-

or end-

pref.

Inside; within: endometrium.

[Greek, from endon, within; see en in Indo-European roots.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

endo-

or before a vowel

end-

combining form

inside; within: endocrine.

[from Greek, from endon within]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

endo-

a combining form meaning “within,” “internal”: endocardial. Also, esp. before a vowel, end-.