fastener

Concise Oxford English Dictionary © 2008 Oxford University Press:
fasten/ˈfɑːsn/

▶verb

• 1 close or do up securely.

  ■ fix or hold in place.

  ■ (fasten something off) secure the end of a thread with stitches or a knot.

• 2 (fasten on/upon) single out (something) and concentrate firmly on it.

– derivatives
fastener noun.

– origin OE fæstnian ‘make sure, confirm’, also ‘immobilize’, of W. Gmc origin; rel. to fast1.