• Webster's Revised Unabridged Dictionary
    • Ento- A combining form signifying within; as, entoblast.
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Century Dictionary and Cyclopedia
    • n ento- A prefix, chiefly used in biological terms, denoting ‘within, inside, inner, internal’: opposed to ecto- and exo-. It is the same as endo-, but is less frequently used; in some cases it is synonymous with hypo-, since that which is internal is also under the surface.
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Webster's Revised Unabridged Dictionary
Gr. within, fr. in. See In


In literature:

Ento-parasite: one that feeds within the body of the host.
"Explanation of Terms Used in Entomology" by John. B. Smith
At last a long-drawn "Ha" from myself duetted (if I may coin the word) with "Y'r ento 'm, sir," from Guthrie.
"Lines in Pleasant Places" by William Senior
Even if you manage to get past Entos and into the Palace, we can have you extradited as a common criminal, for assaulting a Sanctioner.
"A Matter of Honor" by Ann Wilson