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ornithosis
oro-
orogenesis
orogenic
orogenic belt
orogeny
orography
oroide
orology
OROM
Oromo
Orono
Orontes
oropendola
oropharynx
orotund
Oroya fever
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ornithine
or·ni·thine [ áwrnə thn ]


noun 
Definition:
 
amino acid: an amino acid formed in the liver as an intermediate in the manufacture of urea
[Late 19th century < its presence in birds' urine]
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