the action or process of recording a video or (in early use esp.) audio sequence on cinematographic film; a recording made as a result of this…

a narrow strip of magnetic material along the edge of cine film, on which sound may be recorded; (also) any similar strip on which data is stored.

A narrow strip of magnetic material along the edge of a cine film on which the sound may be recorded.

a narrow band of magnetic material on the edge of a film, which contains the sound track.