hemicyclium

American

[hem-i-sik-lee-uhm] / ˌhɛm ɪˈsɪk li əm /

noun

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.

From Latin; see origin at hemicycle

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023