Definition of bolt
1 a
: a shaft or missile designed to be shot from a crossbow or catapult;
especially
: a short stout usually blunt-headed arrow
b
: a lightning stroke;
also
: thunderbolt
2 a
: a wood or metal bar or rod used to fasten a door
b
: the part of a lock that is shot or withdrawn by the key
3
: a roll of cloth or wallpaper of specified length
4
: a metal rod or pin for fastening objects together that usually has a head at one end and a screw thread at the other and is secured by a nut
5 a
: a block of timber to be sawed or cut
b
: a short round section of a log
6
: a metal cylinder that drives the cartridge into the chamber of a firearm, locks the breech, and usually contains the firing pin and extractor
