ASTROMETER
As*trom"e*ter, n. Etym: [Astro- + meter.]
Defn: An instrument for comparing the relative amount of the light of stars.
ASTROMETRY
As*trom"e*try, n. Etym: [Astro- + metry.]
Defn: The art of making measurements among the stars, or of determining their relative magnitudes.
ASTRONOMER
As*tron"o*mer, n. Etym: [See Astronomy.]
1. An astrologer. [Obs.] Shak.
2. One who is versed in astronomy; one who has a knowledge of the laws of the heavenly orbs, or the principles by which their motions are regulated, with their various phenomena. An undevout astronomer is mad. Young.
ASTRONOMIAN
As`tro*no"mi*an, n. Etym: [OE. & OF. astronomien. See Astronomy.]
Defn: An astrologer. [Obs.]
ASTRONOMIC
As`tro*nom"ic, a.