Pronunciation: (zip'ur),[key] —n. 1. Also called slide fastener. a device used for fastening clothing, valises, etc., consisting of two toothed tracks or spiral metal or plastic coils, each bordering one of two edges to be joined, and a piece that either interlocks or separates them when pulled.
2. a person or thing that zips.
3. a rubber and fabric boot or overshoe fastened up the leg by a zipper.
4. a large illuminated display of news bulletins or advertisements that rapidly and continously flash by on an upper part of a building.