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Is there a difference between jamb and jam?

I recently wrote a letter describing someone who had jambed their hand on a stair bannister and the usage was questioned.

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Did you check a dictionary? What in there didn't help? – Hugo Nov 18 '11 at 19:13
Not sure how your sarcasm is supposed to contribute here. This question was marked as answered over six months ago... – Treffynnon Nov 25 '11 at 15:54
up vote 4 down vote accepted

"Jamb" has a very specific meaning. From NOAD:

jamb |jam| noun a side post or surface of a doorway, window, or fireplace. • a columnar mass or pillar in a mine or quarry.

It is not used as a verb, except perhaps figuratively.

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I am aware of the architectural meaning. Looking at OED it seems I am using a very obsolete form. – Treffynnon May 9 '11 at 11:09
What form would that be? oed.com/view/Entry/100691?redirectedFrom=jamb#eid – mplungjan May 9 '11 at 11:16

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