Lewis & Short

Labdăcus, i, m., = Λάβδακος,

  1. I. a king of Thebes, father of Lāius, Sen. Herc Fur. 495; id. Phoen. 53.
  2. II. Hence,
    1. A. Lab-dăcĭus, a, um, adj., of or belonging to Labdacus: dux, i. e. Eteocles, so called after his grandfather Lāius, Stat. Th. 2, 210.
    2. B. Labdăcĭdes, ae, m., a male descendant of Labdacus, a Labdacide; applied to Polynīces as grandson of Laius, Stat. Th. 6, 450.
      Plur.: Labdăcĭdae, ārum, m., the Thebans, Stat. Th. 9, 777; 10, 36.