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orange-tip
orangeade
Orangeburg
Orangeman
orangeroot
orangery
orangewood
orangutan
orate
oration
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oratory (1)
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orca
or·ca [ áwrkə ] (plural or·cas)


noun 
Definition:
 
marine biology 
Same as  killer whale
[Mid-19th century. Via modern Latin< Latin "large sea creature"]
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