Definition of osetra
: a golden or brownish caviar from a sturgeon (such as Acipenser gueldenstaedtii of the Caspian Sea) with roe somewhat smaller than the beluga and having a usually nutty flavor; also : the fish — compare sevruga
From the M-W Editors
Origin and Etymology of osetra
modification of Russian osëtr sturgeon
First Known Use: 1753
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