osmiamic

from 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]