apsis

noun ap·sis \ ˈap-səs \

Definition of apsis

plural apsides play \-sə-ˌdēz\
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 and Etymology of apsis

New Latin apsid-, apsis, from Latin, arch, orbit, from Greek hapsid-, hapsis, from haptein to fasten


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allowing a liquid or gas to pass through

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