impost
noun
- in architecture, a projecting block resting on top of a column or embedded in a wall
Wiktionary
Pronunciation: /ˈɪmpəʊst/ / /ˈɪmpoʊst/
noun
Etymology: From Italian imposta, from Latin imposta.
- The top part of a column, pillar, pier, wall, etc. that supports an arch.
“The outer circle [of Stonehenge] has been formed by a combination of two uprights and an impost; yet each combination of these three stones is detached, and without any connection with the rest, except that of coinciding in the form of a circle.”