The Collaborative International Dictionary of English v.0.48:

Caladium \Ca*la"di*um\, n. [NL.]
   A genus of aroideous plants, of which some species are
   cultivated for their immense leaves (which are often
   curiously blotched with white and red), and others (in
   Polynesia) for food.
   [1913 Webster]

WordNet (r) 3.0 (2006):

caladium
    n 1: any plant of the genus Caladium cultivated for their
         ornamental foliage variously patterned in white or pink or
         red