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onychomycosis
onychopathy
onychophoran
onychorrhexis
onychosis
-onym
onymous
onyx
oo-
ooch (1)
ooch (2)
oocyst
oocyte
OODA Loop
oodles
OOG
oogamete
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ontogeny
on·tog·e·ny [ on tójjənee ] or on·to·gen·e·sis [ òntə jénnəssiss ]


noun 
Definition:
 
development of individual to maturity: the development of an individual from a fertilized ovum to maturity, as contrasted with the development of a group or species phylogeny

on·to·gen·ic [ òntə jénnik ] adjective
on·to·gen·i·cal·ly [ òntə jénni kəlee ] adverb
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