(photography) A photograph produced by exposing film or some other photosensitive surface to focused light twice, usually by opening and closing a camera shutter two times, thereby generating a picture consisting of two superimposed images.

(rare) plural of double-u

plural of double sharp

plural of double flat

(music) An accidental that indicates that a note should be played a whole step higher.

(music) an accidental that indicates that a note should be played a whole step lower

plural of double-ender

(nautical) A vessel capable of moving both forwards and backwards, having bow and rudder at each end. / A locomotive with a pilot at each end.

(of a window) Having both sashes hung with weights and cords, so as to move either upward or downward.

plural of double first