The Collaborative International Dictionary of English v.0.48:

amphotericin \amphotericin\, amphotericin B \amphotericin B\n.
   1. an antibiotic and antifungal agent (C47H73NO17),
      produced by a strain of Streptomyces nodosus. It is one
      of a class of polyene macrolide antibiotics effective
      against fungal infections. It has a molecular weight of
      924.11; it is soluble in oganic solvents but only slightly
      soluble in water.

   Syn: Fungizone. [WordNet 1.5]

WordNet (r) 3.0 (2006):

amphotericin
    n 1: an antibiotic and antifungal agent