hemicyclium

hemicyclium

A semicircular alcove, sufficiently large to provide seating for a group of people.
References in periodicals archive ?
It was called "hemicyclium" and, in addition to an iron needle that indicated the hour by casting a shadow across the engraved lines of the clock face, featured curves that indicated the seasons.
The Babylonians, the Greeks and later the Romans all used sundials--the hemicyclium, the arachne, the antiboreum--but come a cloudy day, these were just clever paperweights.