The Collaborative International Dictionary of English v.0.48:

Rudd \Rudd\, n. [See Rud, n.] (Zool.)
   A fresh-water European fish of the Carp family (Leuciscus
   erythrophthalmus). It is about the size and shape of the
   roach, but it has the dorsal fin farther back, a stouter
   body, and red irises. Called also redeye, roud,
   finscale, and shallow. A blue variety is called
   azurine, or blue roach.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rudd
    n 1: European freshwater fish resembling the roach [syn: rudd,
         Scardinius erythrophthalmus]

U.S. Gazetteer Places (2000):

Rudd, IA -- U.S. city in Iowa
   Population (2000):    431
   Housing Units (2000): 188
   Land area (2000):     0.996758 sq. miles (2.581592 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.996758 sq. miles (2.581592 sq. km)
   FIPS code:            69195
   Located within:       Iowa (IA), FIPS 19
   Location:             43.128528 N, 92.903713 W
   ZIP Codes (1990):     50471
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rudd, IA
    Rudd