The Collaborative International Dictionary of English v.0.48:

Iodoform \I*od"o*form\, n. [Iodo- + formyl. See Formyl, and
   cf. Chloroform.] (Chem.)
   A yellow, crystalline, volatile substance, CI3H, having an
   offensive odor and sweetish taste, and analogous to
   chloroform. It is used in medicine as a healing and
   antiseptic dressing for wounds and sores.
   [1913 Webster]

WordNet (r) 3.0 (2006):

iodoform
    n 1: sweet smelling yellow solid haloform CHI3 [syn: iodoform,
         tri-iodomethane]
    2: a yellowish crystalline solid with a penetrating odor;
       sometimes used as an antiseptic dressing [syn: iodoform,
       triiodomethane]