Word Study
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: Pâ Pæ Pè Pé Pœ P- P. P/ P< Pa Pb Pc Pd Pe Pf Ph Pi Pj Pk Pl Pm Pn Po Pp Pr Ps Pt Pu Pv Pw Px Py
perihelium
CIDE DICTIONARY
perihelium, n. [NL., fr. Gr. about, near + the sun.].
That point of the orbit of a planet or comet which is nearest to the sun; -- opposed to aphelion . [1913 Webster]
For further exploring for "perihelium" in Webster Dictionary Online