• Webster's Revised Unabridged Dictionary
    • n Parhelium See Parhelion.
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Century Dictionary and Cyclopedia
    • n parhelium Same as parhelion.
    • n parhelium A name given by Runge and Paschen to a supposed distinct gas which, on the ground of certain spectroscopic observations, they believed to be present in helium. It has since been shown that the helium examined is but a single substance, the spectroscopic differences being due to change of pressure.
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