D defs.my
Entry 1 sense Webster, 1913

Arcturus

/ärˌ-kto͝or'-əs/ · Arc·tu·rus · IPA /ɑɹkˈtjʊəɹəs/
01 n. A fixed star of the first magnitude in the constellation Boötes.
  1. 1.
    A fixed star of the first magnitude in the constellation Boötes.(Anat.)
    “Canst thou guide Arcturus with his sons [Rev. Ver.: “the Bear with her train”].” — Job xxxviii. 32.