noun
doorjamb; doorpost; vertical frame member
Technical term in architecture and carpentry for the vertical framing piece on either side of a door or window opening. Not an everyday word; used in construction, design, and traditional woodworking contexts.
この建具の縦框は檜でできている。
The doorjambs of this fitting are made of cypress.
縦框の寸法を間違えると、ドアがうまく閉まらない。
If you get the dimensions of the vertical frame wrong, the door won't close properly.
Compound of 縦 (たて, 'vertical') and 框 (がまち, 'frame, jamb'). The reading がまち is a specialized carpentry term for frame members.