from The Century Dictionary and Cyclopedia
- n. In architecture, a small shaft having a capital and a base, placed against or forming part of the jamb of a door or window. Such shafts occur most frequently in medieval architecture. See cut on preceding page.
Sorry, no etymologies found.
Heavy walls, recessed arches, round mouldings, cubic cushion-caps, clustered piers, and in doorways a jamb-shaft for each stepping of the arch were common to both styles.