Hypertext Webster Gateway: "jamb"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Jamb \Jamb\, n. [Prov. E. jaumb, jaum, F. jambe a leg, jambe de
force a principal rafter. See {Gambol}.]
1. (Arch) The vertical side of any opening, as a door or
fireplace; hence, less properly, any narrow vertical
surface of wall, as the of a chimney-breast or of a pier,
as distinguished from its face. --Gwilt.
2. (Mining) Any thick mass of rock which prevents miners from
following the lode or vein.
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Jamb \Jamb\, v. t.
See {Jam}, v. t.
From WordNet (r) 1.7 (wn)
jamb
n : upright consisting of a vertical side member of a door or
window frame
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