Nephelium lappaceum

from WordNet (r) 3.0 (2006)

Nephelium lappaceum
    n 1: Malayan tree bearing spiny red fruit [syn: {rambutan},
         {rambotan}, {rambutan tree}, {Nephelium lappaceum}]

from The Collaborative International Dictionary of English v.0.48

Rambutan \Ram*bu"tan\ (r[a^]m*b[=oo]"t[a^]n), n. [Malay
   ramb[=u]tan, fr. rambut hair of the head.] (Bot.)
   A Malayan fruit produced by the tree {Nephelium lappaceum},
   and closely related to the litchi nut. It is bright red, oval
   in shape, covered with coarse hairs (whence the name), and
   contains a pleasant acid pulp. Called also {ramboostan}.
   [1913 Webster]