noun
1. : either of two diseases of raspberries and blackberries caused by two rusts ( Gymnoconia peckiana and Kunkelia niteus ) and characterized by retarded growth and curled and distorted usually small leaves lacking in green color and with bright red or orange powder on the under surfaces ; also : the fungus causing either disease
2. : a strong yellowish brown that is redder, stronger, and slightly darker than buckthorn brown and redder and deeper than centennial brown