The Collaborative International Dictionary of English v.0.48:
Fastener \Fas"ten*er\, n. One who, or that which, makes fast or firm. [1913 Webster]WordNet (r) 3.0 (2006):
fastener n 1: a person who fastens or makes fast; "he found the door fastened and wondered who the fastener was" 2: restraint that attaches to something or holds something in place [syn: fastener, fastening, holdfast, fixing]