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per·i·he·li·on  (pĕr′ə-hele-ən, -helyən)
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Tweet n.pl. per·i·he·li·a(-hele-ə, -helyə) The point in a solar orbit where the orbiting body is closest to the sun. [Alteration ofNew Latinperihelium : PERI– + Greekhelios, sun; see sāwel- in the Appendix of Indo-European roots.] per′i·heli·al(-hele-əl, -helyəl)adj.  (click for a larger image) perihelion |
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