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Define the word H2N2Os2O5

"H2N2Os2O5" gcide "The Collaborative International Dictionary of English v.0.48"

Osmiamic \Os`mi*am"ic\, a. [Osmium + amido.] (Chem.)
   Of, pertaining to, or designating, a nitrogenous acid of
   osmium, H2N2Os2O5, forming a well-known series of yellow
   salts.
   [1913 Webster]