I don't think it really matters much but here is the Oxford English Dictionary definition of "jamb":
Archit. Each of the side posts of a doorway, window, or chimney-piece, upon which rests the lintel; a cheek; esp., in popular use, (pl.) the stone sides or cheeks of a fire-place.
There are also some less common, rare or obsolete meanings, viz:
A projecting columnar part of a wall; a columnar mass or pillar in a quarry or mine.
Each of the two side-pieces or cheeks of anything. rare.
A projecting ‘wing’ of a building. Obs.
An angular turn or corner in a street or way. Obs.
Archit. Each of the side posts of a doorway, window, or chimney-piece, upon which rests the lintel; a cheek; esp., in popular use, (pl.) the stone sides or cheeks of a fire-place.
There are also some less common, rare or obsolete meanings, viz:
A projecting columnar part of a wall; a columnar mass or pillar in a quarry or mine.
Each of the two side-pieces or cheeks of anything. rare.
A projecting ‘wing’ of a building. Obs.
An angular turn or corner in a street or way. Obs.
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