Hypertext Webster Gateway: "Perihelium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Perihelion \Per`i*hel"ion\, Perihelium \Per`i*he"li*um\, n.; pl.
{Perihelia}. [NL., fr. Gr. ? about, near + ? the sun.]
(Astron.)
That point of the orbit of a planet or comet which is nearest
to the sun; -- opposed to {aphelion}.
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