noun ap·sis \ˈap-səs\

Definition of apsis



play \-sə-ˌdēz\
  1. 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. 2 :  apse 2

Origin and Etymology 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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