fastener
noun [ C ] uk/ˈfɑːs.ən.ər/ us/ˈfæs.ən.ɚ/
纽扣；拉链；扣件
a button, zip, or other device for temporarily joining together the parts of things such as clothes
US (UK fastening)（窗、门、盒子等的）扣件，紧固件
a device on a window, door, box, etc. for keeping it closed