Definitions for "Roll Film"
Any film that is packaged in rolls (typically for multiple exposures) rather than single-exposure sheets. Usually refers to medium formats, not 35mm.
Flexible film giving several exposures on a continuous length of material. Originally unbacked and loaded in a darkroom, from 1895 more usually with an opaque numbered paper backing for daylight loading.
Refers to 120, 220 and 620 film formats. Usually purchased with the ability to take either 12, 24 or 36 photos per roll.