The Collaborative International Dictionary of English v.0.48:

gumbo-limbo \gumbo-limbo\ n.
   A tropical American tree (Bursera simaruba) yielding a
   reddish resin used in cements and varnishes.

   Syn: Bursera simaruba.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

gumbo-limbo
    n 1: tropical American tree yielding a reddish resin used in
         cements and varnishes [syn: gumbo-limbo, Bursera
         simaruba]