a. [ Gr. 'amfo`teros both. ] 1. Partly one and partly the other [ 1913 Webster ]

2. Especially: (Chem.) Having both acidic and basic groups within the same molecule, and consequently neither acid nor alkaline; neutral. [ R. ] Smart. [ PJC ]

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 ]