noun
definition
(heading, biological) Part of a body.
definition
(heading) A container.
definition
(heading) A channel for flow of some kind.
definition
In software projects under source control: the most current source tree, from which the latest unstable builds (so-called "trunk builds") are compiled.
definition
The main line or body of anything.
example
the trunk of a vein or of an artery, as distinct from the branches
definition
A large pipe forming the piston rod of a steam engine, of sufficient diameter to allow one end of the connecting rod to be attached to the crank, and the other end to pass within the pipe directly to the piston, thus making the engine more compact.
definition
Shorts used for swimming (swim trunks).