king-post n.
〈建〉桁架中柱
King-post \King"-post`\, n. (Carp.)
A member of a common form of truss, as a roof truss. It is
strictly a tie, intended to prevent the sagging of the
tiebeam in the middle. If there are struts, supporting the
main rafters, they often bear upon the foot of the king-post.
Called also {crown-post}.