The Collaborative International Dictionary of English v.0.48:

Rattan \Rat*tan"\ (r[a^]t*t[a^]n"), n. [Malay r[=o]tan.]
   [Written also ratan.] (Bot.)
   One of the long slender flexible stems of several species of
   palms of the genus Calamus, mostly East Indian, though some
   are African and Australian. They are exceedingly tough, and
   are used for walking sticks, wickerwork, chairs and seats of
   chairs, cords and cordage, and many other purposes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

rattan
    n 1: climbing palm of Sri Lanka and southern India remarkable
         for the great length of the stems which are used for
         malacca canes [syn: rattan, rattan palm, Calamus
         rotang]
    2: the stem of various climbing palms of the genus Calamus and
       related genera used to make wickerwork and furniture and
       canes [syn: rattan, rattan cane]
    3: a switch made from the stems of the rattan palms [syn:
       rattan, ratan]

U.S. Gazetteer Places (2000):

Rattan, OK -- U.S. town in Oklahoma
   Population (2000):    241
   Housing Units (2000): 127
   Land area (2000):     3.978293 sq. miles (10.303732 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    3.978293 sq. miles (10.303732 sq. km)
   FIPS code:            61950
   Located within:       Oklahoma (OK), FIPS 40
   Location:             34.202167 N, 95.410914 W
   ZIP Codes (1990):     74562
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Rattan, OK
    Rattan