DERRICK n.
A mast, spar, or tall frame, supported at the top by stays or guys, with suitable tackle for hoisting heavy weights, as stones in building. Derrick crane, a combination of the derrick and the crane, having facility for hoisting and also for swinging the load horizontally.
DOCTRINE n.
That which is taught; what is held, put forth as true, and supported by a teacher, a school, or a sect; a principle or position, or the body of principles, in any branch of knowledge; any tenet or dogma; a principle of faith; as, the doctrine of atoms; the doctrine of chances. "The doctrine of gravitation." I. Watts. A…