phen
combining form(phen-)
related to or derived from benzene
phen
combining form(phen-)
containing phenyl
phen
noun(phen-)
a former diet drug combination of phentermine with either fenfluramine or dexfenfluramine —called also phen-fen
phen
noun(phen-)
an herbal preparation typically containing ephedra and Saint-John's-wort that was used as an appetite suppressant until one of its ingredients (ephedra) was banned in the U.S. by the FDA in 2004