D defs.my
Entry 2 senses Webster, 1913

Astronomer

/əs-trän'-əm-ẽr/ · As·tron·o·mer · IPA /əˈstɹɑ.nə.mɚ/
01 n. An astrologer.
  1. 1.
    An astrologer.[Obs.]
  2. 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.