An internally threaded screw having a slotted head.

plural of barrel nut

(architecture) A roof having a semicircular cross section; used to span large distances in railway stations etc

A musical instrument in which air from a bellows is admitted to a set of pipes by means of pins inserted into a revolving barrel (typically turned by a crank), originating in France.

A large, somewhat misshapen chest; sometimes associated with emphysema

Having a barrel chest

(dated) intoxication or illness from intemperance in drink

plural of Damascus barrel

plural of barrel organ

(idiomatic) In a disadvantageous or helpless situation, especially one in which one may be controlled or victimized.