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:the part of a lock that is shot or withdrawn by the key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
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