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[jam] /dʒæm/
Architecture, Building Trades.
  1. either of the vertical sides of a doorway, arch, window, or other opening.
  2. either of two stones, timbers, etc., forming the sidepieces for the frame of an opening.
Armor. greave.
Also, jambe.
Origin of jamb1
1350-1400; Middle English jambe < Middle French: leg, jamb < Late Latin gamba, variant of camba pastern, leg < Greek kampḗ bend of a limb


[jam] /dʒæm/
verb (used with object), verb (used without object), Obsolete
jam1 . Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for jamb
  • Even a door that measures the right size may often need fine-tuning on one or more sides to fit an existing jamb.
  • The white vinyl jamb liner is installed and the sash put back into place.
  • Blades to be one piece aluminum extrusions with gutters designed to catch and direct water to jamb and mullion drains.
  • The fixed meeting rail is fastened at each side jamb with screws.
  • Remove wood spreaders and braces only after the walls are built and jamb anchors are secured.
  • The fasteners are required along each side jamb only.
  • The head stop and side jamb stops are secured with staples.
  • Screw a lag bolt into the jamb, sawing off the head.
  • The frame corners are secured with staples and screws through the jamb liner into the jamb.
British Dictionary definitions for jamb


a vertical side member of a doorframe, window frame, or lining
a vertical inside face of an opening in a wall
Word Origin
C14: from Old French jambe leg, jamb, from Late Latin gamba hoof, hock, from Greek kampē joint
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for jamb

side-piece of a door, window, etc., early 14c., from Old French jambe "pier, side post of a door," originally "a leg, shank" (12c.), from Late Latin gamba "leg, (horse's) hock" (see gambol).

Online Etymology Dictionary, © 2010 Douglas Harper
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