One of the mysteries of the English language finally explained.
Caviar from the Russian sturgeon, Acipenser gueldenstaedtii. Hence also: the fish itself.
1920s; earliest use found in The Times. From Russian osetrova(ja), use as noun of feminine of osetrov(yj) of sturgeon (from osëtr + -ov(yj), suffix forming adjectives), short for ikra osetrova(ja) sturgeon's caviar.
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