/days/ , n. , pl. ( esp. collectively ) dace , ( esp. referring to two or more kinds or species ) daces .
1. a small, freshwater cyprinoid fish, Leuciscus leuciscus, of Europe, having a stout, fusiform body.
2. any of several similar or related fishes of the U.S.
[ 1400-50; late ME darce, darse dars darsus ]