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perihelium |
1 definition found 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}.