Word Study
sterlet
CIDE DICTIONARY
sterlet, n. [Russ. sterliade.].
A small sturgeon (Acipenser ruthenus ) found in the Caspian Sea and its rivers, and highly esteemed for its flavor. The finest caviar is made from its roe. [1913 Webster]
OXFORD DICTIONARY
sterlet, n. a small sturgeon, Acipenser ruthenus, found in the Caspian Sea area and yielding fine caviare.
Etymology
Russ. sterlyad'
For further exploring for "sterlet" in Webster Dictionary Online