| APS | <abbreviation> Adenosine 5'-phosphosulfate. (05 Mar 2000) |
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| apsidal | 1. <astronomy> Of or pertaining to the apsides of an orbit. 2. Of or pertaining to the apse of a church; as, the apsidal termination of the chancel. Source: Websters Dictionary (01 Mar 1998) |
| apsis | Origin: L. Apsis, absis, Gr, a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, fr. To fasten. 1. <astronomy> 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. <mathematics> In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum. 3. Same as Apse. Source: Websters Dictionary (01 Mar 1998) |
| 6-APS | <abbreviation> 6-aminopenicillanic acid. (05 Mar 2000) |
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