GNU Collaborative International Dictionary of English

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1.       
   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.
   1913 Webster