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hemicyclium

[hem-i-sik-lee-uh m]
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noun
  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.
Also hemicycle.

Origin of hemicyclium

From Latin; see origin at hemicycle
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018