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

combining form representing Greek entós

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World English Dictionary
combining form
inside; within: entoderm
[New Latin, from Greek entos within]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"within, inside, inner," from Gk. ento-, comb. form of entos "within, inside" (cognate of L. intus), from PIE *entos, from *en- "in" + adv. suffix -tos, denoting origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ento- or ent-
Inside; within: entozoon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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