n. (pl. -ies) 1 foolishness; lack of good sense. 2 a foolish act, behaviour, idea, etc. 3 an ornamental building, usu. a tower or mock Gothic ruin. 4 (in pl.) Theatr. a a revue with glamorous female performers, esp. scantily-clad. b the performers.
[ ME f. OF folie f. fol mad, FOOL(1) ]