Dictionary

apsis

noun ap·sis \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: 1601

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