| 释义 |
WordReference Random House Unabridged Dictionary of American English © 2024ap•sis (ap′sis),USA pronunciation n., pl. -si•des (-si dēz′).USA pronunciation - Astronomyeither of two points in an eccentric orbit, one (higher apsis) farthest from the center of attraction, the other (lower apsis) nearest to the center of attraction.
- Architecturean apse.
- Greek hapsís (felloe of ) a wheel, arch, vault, origin, originally, fastening, equivalent. to háp(tein) to fasten + -sis -sis
- Latin
- 1595–1605
Collins Concise English Dictionary © HarperCollins Publishers:: apsis /ˈæpsɪs/ n ( pl apsides /æpˈsaɪdiːz; ˈæpsɪˌdiːz/)
Also called: apse either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc, such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit- another name for apse
Etymology: 17th Century: via Latin from Greek; see apseapsidal /æpˈsaɪdəl; ˈæpsɪdəl/ adj |