Wordnet 3.0
NOUN (1)
1. 
 a native or inhabitant of Madagascar; 
ADJECTIVE (1)
1. 
 of or relating to Madagascar or its people; 
- Example: "Madagascan pepper"
The Collaborative International Dictionary of English v.0.48:
Madagascan \Madagascan\ prop. a.
   1. Of or pertaining to Madagascar; as, Madagascan pepper.
      [WordNet 1.5]
   2. Of or pertaining to the inhabitants of Madagascar; as,
      Madagascan soldiers.
   Syn: Malagasy.
        [WordNet 1.5]
The Collaborative International Dictionary of English v.0.48:
Madagascan \Madagascan\ prop. n.
   A native or inhabitant of Madagascar.
   [WordNet 1.5]
The Collaborative International Dictionary of English v.0.48:
Madecassee \Mad`e*cas"see\, prop. a.
   Of or pertaining to Madagascar or its inhabitants; now
   replaced by Madagascan. [archaic]
   [1913 Webster +PJC] Madefaction
WordNet (r) 3.0 (2006):
Madagascan
    adj 1: of or relating to Madagascar or its people; "Madagascan
           pepper"
    n 1: a native or inhabitant of Madagascar