oka

noun

less common spelling of oca

: a South American wood sorrel (Oxalis tuberosa) cultivated for its edible tubers

also : the tuber of an oca

Geographical Definition

Oka

geographical name

ō-ˈkä 

1

river 530 miles (853 kilometers) long in south central Russia in Asia flowing north from the Sayan Mountains into the Angara River

2

river 919 miles (1479 kilometers) long in central Russia in Europe flowing into the Volga River