Definitions of Terms under Alphabet K
Knuckle

The feature of a hinge where the hinge leaf is cut for two or three projections which wrap and form a barrel or socket for the hinge pin.

King Stud

In a wood-framed rough opening, the stud which runs full height from floor plate to ceiling plate where trimmer stud attaches.

Kerf

A thin slot cut into an exterior jamb, that weather-stripping can be inserted.