Main Entry: ter·fen·a·dine Pronunciation: (")t&r-'fen-&-"dEn Function: noun : an antihistamineC32H41NO2 that does not produce the drowsiness associated with many antihistamines —see SELDANE
terfenadine ter·fen·a·dine (tər-fěn'ə-dēn') n. An antihistamine used to treat a variety of allergic symptoms and having less of a sedative effect than other antihistamines.