fas·ten·er

[fas-uh-ner, fah-suh-]
noun
1.
any of various devices for fastening.
2.
any of various devices, as a snap or hook and eye, for holding together two objects or parts sometimes required to be separate, as two edges or flaps of a piece of clothing.
3.
a worker who fastens things together.

Origin:
1620–30; fasten + -er1

un·fas·ten·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To fastener
Collins
World English Dictionary
fasten (ˈfɑːsən) [Click for IPA pronunciation guide]
 
vb (usually foll by on) (usually foll by on or upon) (usually foll by on)
1.  to make or become fast or secure
2.  to make or become attached or joined
3.  to close or become closed by fixing firmly in place, locking, etc
4.  (tr; foll by in or up) to enclose or imprison
5.  to cause (blame, a nickname, etc) to be attached (to); place (on) or impute (to)
6.  to direct or be directed in a concentrated way; fix: he fastened his gaze on the girl
7.  take firm hold (of)
 
[Old English fæstnian; related to Old Norse fastna to pledge, Old High German fastinōn to make fast; see fast1]
 
'fastener
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Fastener is always a great word to know.
So is doohickey. Does it mean:
a chattering or flighty, light-headed person.
a gadget; dingus; thingumbob.
Example sentences
Fastener size and hole size shall be specified on the engineering drawing.
Impressed by the stickiness of the bur's hooks, he copied the design,
  engineering a two-piece fastener.
The slide fastener shall be non-separating, single action, with a stop on each
  end.
The fastener has special usefulness in high temperature applications where high
  reliability is important.
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