noun ap·sis \ˈap-səs\
plural ap·si·des \-sə-ˌdēz\

Definition of APSIS

:  the point in an astronomical orbit at which the distance of the body from the center of attraction is either greatest or least
:  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


Next Word in the Dictionary: apt (adjective)Previous Word in the Dictionary: apsidioleAll Words Near: apsis
July 05, 2015
bunkum Hear it
insincere or foolish talk
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears