Hypertext Webster Gateway: "semidome"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Semidome \Sem"i*dome`\, n. (Arch.)
A roof or ceiling covering a semicircular room or recess, or
one of nearly that shape, as the apse of a church, a niche,
or the like. It is approximately the quarter of a hollow
sphere.
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