jamb

1 [jam]
noun
1.
Architecture, Building Trades.
a.
either of the vertical sides of a doorway, arch, window, or other opening.
b.
either of two stones, timbers, etc., forming the sidepieces for the frame of an opening.
2.
Armor. greave.
Also, jambe.


Origin:
1350–1400; Middle English jambe < Middle French: leg, jamb < Late Latin gamba, variant of camba pastern, leg < Greek kampḗ bend of a limb

Dictionary.com Unabridged

jamb

2 [jam]
verb (used with object), verb (used without object) Obsolete.
jam1.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
jamb or jambe (dʒæm)
 
n
1.  a vertical side member of a doorframe, window frame, or lining
2.  a vertical inside face of an opening in a wall
 
[C14: from Old French jambe leg, jamb, from Late Latin gamba hoof, hock, from Greek kampē joint]
 
jambe or jambe
 
n
 
[C14: from Old French jambe leg, jamb, from Late Latin gamba hoof, hock, from Greek kampē joint]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

jamb
1334, from O.Fr. jambe "pier, side post of a door," originally "a leg, shank," from L.L. gamba "leg, (horse's) hock" (see gambol).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
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.
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