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J

Jacobean Revival style:  Victorian revival of the grand, sumptuous style that appeared in the early 1600s.  It is typified by Dutch gables, mullioned windows, and ornate stonework.
jamb:  The stones forming the side of a door or window.
Jerkin head / short hip roof: a gable roof, truncated or clipped at the apex. joists: Any of the small timbers or metal beams ranged parallel from wall to wall in a structure to support a floor or ceiling.