The spelling of the word "Osseter" is often questioned due to its peculiar pronunciation. In IPA phonetic transcription, it is spelled as /ɑːsətər/. The initial "O" sound is pronounced as "aw," followed by the "ss" sound spelled as "ss" and pronounced as a voiceless alveolar sibilant, followed by the "e" sound spelled as "e" and pronounced as a schwa, and finally the "ter" sound spelled "ter" and pronounced as a schwa-r sound.
A species of sturgeon, said to yield one of the best kinds of Russian isinglass.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.