onto-

onto-

a combining form meaning “being,” used in the formation of compound words: ontogeny.
Also, especially before a vowel, ont-.


Origin:
< Neo-Latin < Greek ont- (stem of ón, neuter present participle of eînai to be) + -o- -o-

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Collins
World English Dictionary
onto-
 
combining form
existence or being: ontogeny; ontology
 
[from Late Greek, from ōn (stem ont-) being, present participle of einai to be]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

onto- or ont-
pref.
Organism; being: ontogeny.

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