ap·sis  ( ăp s ĭs)
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n. pl. ap·si·des (-s ĭ-d ēz ′) 1. Architecture An apse. 2. Astronomy The point of greatest or least distance of the orbit of a celestial body from the center of mass of the system.
[Late Latin, from Latin, arch, vault, from Greek hapsis, from haptein, to fasten.] |
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