The Collaborative International Dictionary of English v.0.48:

Ratan \Ra*tan"\ (r[.a]*t[a^]n"), n.
   See Rattan.
   [1913 Webster]

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):

ratan
    n 1: a switch made from the stems of the rattan palms [syn:
         rattan, ratan]