sterletPronunciation: /ˈstəːlɪt/Definition of sterlet noun a small sturgeon of the Danube basin and Caspian Sea area, farmed and commercially fished for its flesh and caviar. Acipenser ruthenus, family Acipenseridae Origin: late 16th century: from Russian sterlyadʹsterlet in other Oxford dictionaries Definition of sterlet in the US English dictionary