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De - Pt| English Dictionary: apsides | by the DICT Development Group |
| 2 results for apsides | |
| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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Apsides \Ap"si*des\, n. pl. See {Apsis}. | |
| From Webster's Revised Unabridged Dictionary (1913) [web1913]: | |
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d8Apsis \[d8]Ap"sis\ ([acr]p"s[icr]s), n.; pl. {Apsides} ([acr]p"s[icr]*d[emac]z). See {Apse}. [L. apsis, absis, Gr. "apsi`s, "apsi^dos, a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, fr. "a`ptein to fasten.] 1. (Astron.) One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line joining them, the line of apsides. 2. (Math.) In a curve referred to polar co[94]rdinates, any point for which the radius vector is a maximum or minimum. 3. (Arch.) Same as {Apse}. | |
