Either of the vertical sides of a doorway, arch, window, or other opening. (Dictionary.com)
Either of two stones, timbers, etc., forming the sidepieces for the frame of an opening. (Dictionary.com)
A side post or surface of a doorway, window, or fireplace. (Oxford Dictionaries)
Examples
How do I repair a broken wooden door jamb?

https://diy.stackexchange.com/questions/18550/how-do-i-repair-a-broken-wooden-door-jamb
Blog about home design. Jamb.

https://blog.about-home-design.com/word-week-jamb/
Pocket Door Jamb.

http://fernat.com/blog/collection-of-amazing-modern-little-apartment-designs/
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