-Moulding and Millwork Jargon-

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Dentil-
A series of small square blocks uniformly spaced and projecting like teeth.  Often used in a cornice or mantel treatment.
Dimensional Stability-
The ability of a material to maintain its original dimensions under variations of temperature, moisture, and physical stress.
Door Frame-
A group of wood parts machined as assembled to form a door enclosure and support.
Door Jamb-
A door frame part which surrounds and contacts the edges of the door stiles and top rail.  Jamb parts are classified as "head" or "side" jambs either  "plain" or "rabbeted."
Adjustable Door Jamb (Split Jamb)-
A two (sometimes three) piece split jamb consisting of a rabbeted and adjusting jamb section for walls of varying thickness; the rabbeted jamb contains a plow to receive the tongue of the adjustable member.
Flat Door Jamb-
A jamb surface four sides to which a separate wood stop may be applied.  Also referred to as a one-piece jamb.
Head Jamb-
The horizontal member forming the top of the opening.
Hinge Jamb-
Side jamb in which the door hinges (butts) are applied.
Rabbeted Door Jamb-
A jamb with a rabbet on one or both edges.  If both edges are rabbeted, "double-rabbeted door jamb."  If one edge is rabbeted, "plain rabbeted door jamb."
Side Jamb-
The upright or vertical member forming the side of opening.
Strike Jamb-
The jamb opposite the hinge jamb on which the lock or strike plate is installed.
Drip Cap-
Applied over the exterior window and door frames, this moulding keeps water from seeping under the siding, also directs away from window glass.  Makes an attractive contemporary interior door and window casing.

Drip Groove-
A semicircular grove on the underside of the drip cap or the lip of a window sill which prevents water from running back under the drip or sill.

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