1 apsides | Definition of apsides
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apsis

noun
ap·​sis | \ ˈap-sÉ™s How to pronounce apsis (audio) \
plural apsides\ -​sÉ™-​ËŒdÄ“z How to pronounce apsides (audio) \

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 sense 2

First Known Use of apsis

1601, in the meaning defined at sense 1

History and Etymology for apsis

borrowed from Medieval Latin apsīs, apsīda "arc, vault," going back to Latin apsīd-, apsīs (also hapsīs, absīs) "arc described by a planet, segment of a circle," borrowed from Greek hapsīd-, hapsís (Ionic apsís) "loop, mesh, rim of a wheel, wheel, disk, segment cut off by a rainbow, arch, vault," from ap-s-, stem in noun derivation of háptein "to fasten," háptesthai "to fasten oneself to, grasp" + -īd-, -īs, noun suffix — more at haptics

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More from Merriam-Webster on apsis

Britannica.com: Encyclopedia article about apsis

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