• (a.) Of, pertaining to, or designating, a nitrogenous acid of osmium, H2N2Os2O5, forming a well-known series of yellow salts.
Os`mi·am'ic adjective [ Osmi um + am ido.] (Chemistry) Of, pertaining to, or designating, a nitrogenous acid of osmium, H 2 N 2 Os 2 O 5 , forming a well-known series of yellow salts.