Webster's Revised Unabridged Dictionary · 1913

Rud

Rud , noun

[Anglo-Saxon rudu, akin to reád red. r113. See Red, and compare Ruddy.]

1.
Redness; blush. [Obsolete]
2.
Ruddle; red ocher.
3.
(Zoology) The rudd.

Rud , transitive verb

To make red. [Obsolete] — Spenser