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oroide
orology
OROM
Oromo
Orono
Orontes
oropendola
oropharynx
orotund
Oroya fever
orphan
orphan assets
orphan site
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orthogenesis
or·tho·gen·e·sis [ àwrthō jénnəssiss ]


noun 
Definition:
 
theory of evolution: an obsolete theory that evolution can proceed in a direction determined by internal genetic factors rather than the external forces of natural selection

or·tho·ge·net·ic [ àwrthō jə néttik ] adjective
or·tho·ge·net·i·cal·ly [ àwrthō jə néttikəlee ] adverb
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