The Collaborative International Dictionary of English v.0.48:

madagascar pepper \madagascar pepper\ n. (Bot.)
   A climber (Piper nigrum) having dark red berries
   (peppercorns) when fully ripe; found in South India and Sri
   Lanka; naturalized in North Burma and Assam.

   Syn: pepper, common pepper, black pepper, white pepper,
        Madagascar pepper, Piper nigrum.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Madagascar pepper
    n 1: climber having dark red berries (peppercorns) when fully
         ripe; southern India and Sri Lanka; naturalized in northern
         Burma and Assam [syn: pepper, common pepper, black
         pepper, white pepper, Madagascar pepper, Piper
         nigrum]