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ortolan
ORV
Orvieto
-ory
oryx
orzo
OS
Os
os (1)
os (2)
OSA
Osage (1)
Osage (2)
Osage orange
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os (1)
os [ oss ] (plural o·ra [ áwrə ])


noun 
Definition:
 
mouth: a mouth or similar opening in an organism
[Mid-18th century. < Latin, "mouth, face, head" (stem or-)]
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