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Meaning of hemicyclium

hem•i•cyc•li•um

Pronunciation: (hem"i-sik'lē-um), [key]
— n.
  1. a sundial in the form of a concave quarter sphere having a rodlike gnomon lying within one radius and marked on its surface with arcs that lie in the same plane as the gnomon.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.