hemicyclium

Etymology
, substantive of.

Noun

 * 1) half circle, semicircle
 * 2) semicircular recess with seats
 * 3) semicircular public place furnished with rows of seats for learned discussions
 * 4) semicircular kind of sundial
 * 1) semicircular public place furnished with rows of seats for learned discussions
 * 2) semicircular kind of sundial
 * 1) semicircular kind of sundial
 * 1) semicircular kind of sundial