noun

1. any of a number of perennial or annual garden plants (genera Cheiranthus and Erysimum) of the crucifer family, having racemes of cross-shaped flowers, usually yellow or orange; esp., a common perennial (C. cheiri) having racemes of fragrant, colorful flowers
2. Informal a person, esp. a girl, who merely looks on at a dance, etc., sometimes from shyness but usually from not having been chosen as a partner