Definition of perosmic in US English:

perosmic

adjective

Chemistry
  • Of osmium in its highest oxidation state (8). Chiefly in "perosmic acid"noun = "osmium tetroxide", "osmic acid".

Origin

Late 19th century; earliest use found in The Athenaeum. From per- + osmic.

Pronunciation

perosmic

/pəˈrɒzmɪk/