Definition of osmate in US English:

osmate

noun

Chemistry
  • A salt or ester of osmic acid; a salt containing oxyanions of osmium, especially one containing the anion [OsO₂(OH)₄]2−. Compare earlier osmiate.

Origin

Mid 19th century. From osm- + -ate.

Pronunciation

osmate

/ˈɒzmeɪt/