lag screw

lag screw

noun
a heavy wood screw having a square or hexagonal head driven by a wrench.
Also called coach screw, lag bolt.


Origin:
1870–75

Dictionary.com Unabridged

lag-screw

[lag-skroo]
verb (used with object)
to fasten with a lag screw.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
lag screw
 
n
a woodscrew with a square head
 
[from lag³; the screw was originally used to fasten barrel staves]

Collins English Dictionary - Complete & Unabridged 10th Edition
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