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onto-

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

Origin of onto-

< New Latin < Greek ont- (stem of ón, neuter present participle of eînai to be) + -o- -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for onto-

onto-

combining form
  1. existence or beingontogeny; ontology
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Word Origin

from Late Greek, from ōn (stem ont-) being, present participle of einai to be
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for onto-

word-forming element meaning "a being, individual; being, existence," from Greek onto-, from stem of on (genitive ontos) "being," neuter present participle of einai "to be" (see essence).

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Online Etymology Dictionary, © 2010 Douglas Harper

onto- in Medicine

onto-

pref.
  1. Organism; being:ontogeny.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.