-s( ə )nə(r) noun
( -s )
: one that fastens: as
a. : a device (as a button, hook and eye, zipper, or snap) that joins together separate parts or closes an opening (as on a garment)
b. : a device for holding shut or preventing opening
attached a chain fastener to the door
a catch fastener on a traveling bag
c. : a worker who fastens together the timbers, subassemblies, steel plates, and other parts in the construction of ships