Rambutan \Ram*bu"tan\, 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.

Source: Webster's Revised Unabridged Dictionary (1913)