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omnium-gatherum
omnivore
omnivorous
OMOV
omphalos
Omsk
-on (1)
-on (2)
ON
on
on-again, off-again
on-board bill of lading
on dit
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on-label
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onanism
o·nan·ism [ ṓnə nìzzəm ]


noun 
Definition:
 
1. masturbation: the act of masturbating
2. 
Same as  coitus interruptus
[Early 18th century. After Onan, a character in the Bible (Genesis 38:9), who spilled his semen onto the ground rather than impregnate his deceased brother's wife]

o·nan·ist noun
o·nan·is·tic [ nə nístik ] adjective
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