osetra
Caviar made from the Russian sturgeon.
uncountable
The saumon sauvage and baked potatoes stuffed with osetra were provided by Caviar Kaspia, the Paris restaurant […].
Where it comes from
From Russian осетра́ (osetrá, “of sturgeon”, genitive of осётр (osjótr, “surgeon”)), from the phrase икра́ осетра́ (ikrá osetrá, “caviar of sturgeon”)
Adapted from the Wiktionary entry osetra (CC BY-SA 4.0).