Entry 1 sense Webster, 1913 zipper /zĭʹpər/ · zip·per · IPA /ˈzɪpɚ/ 01 n. a device for locking together two toothed edges by means of a sliding tab. 1. a device for locking together two toothed edges by means of a sliding tab. Syn. slide fastener, zip, zip-fastener.