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1) H20. More commonly known as water.
2) The compound which one Southern California town beileved was an extrememly harmful chemical after receiving a fraudulent warning letter. They pondered banning styrofoam cups after discovering 'dangerous' dihydrogen oxide is used in producing them.
John was thristy so he drank some dihydrogen oxide.
by 9 March 18, 2004
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"Ban dihydrogen oxide! It is a dangerous chemical!"

"That joke was funny, maybe 4 years ago."
by Kiko December 16, 2003
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