apsis
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About Our Definitions: All forms of a word (noun, verb, etc.) are now displayed on one page.ap·sis
noun \ˈap-səs\ plural ap·si·des \-sə-ˌdēz\
Definition of APSIS
1
: the point in an astronomical orbit at which the distance of the body from the center of attraction is either greatest or least
2
: apse 2
Origin of APSIS
New Latin apsid-, apsis, from Latin, arch, orbit, from Greek hapsid-, hapsis, from haptein to fasten
First Known Use: 1658
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