The Collaborative International Dictionary of English v.0.48:
Rud \Rud\, n. [AS. rudu, akin to re['a]d red. [root]113. See Red, and cf. Ruddy.] 1. Redness; blush. [Obs.] [1913 Webster] 2. Ruddle; red ocher. [1913 Webster] 3. (Zool.) The rudd. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Rud \Rud\, v. t. To make red. [Obs.] --Spenser. [1913 Webster]