Lewis & Short

1. pālus, i, m. (neutr. collat. form pālum, i, Varr. ap. Non. 219, 18) [for paglus (cf. dim. paxillus); root pag-; Sanscr. pācas, snare; Gr. πήγνυμι, fasten; Lat. pango; cf.: pignus, pax], a stake, prop, stay, pale.

  1. I. Lit. (very freq. and class.; syn.: sudes, stipes): ut figam palum in parietem, Plaut. Mil. 4, 4, 4; id. Men. 2, 3, 53: damnati ad supplicium traditi, ad palum alligati, Cic. Verr. 2, 5, 5, § 11: palis adjungere vitem, Tib. 1, 8 (7), 33; Ov. F. 1, 665: palos et ridicas dolare, Col. 11, 2, 11; Varr. 1. 1.
    The Roman soldiers learned to fight by attacking a stake set in the ground, Veg. Mil. 1, 11; 2, 23; hence, aut quis non vidit vulnera pali? Juv. 6, 246.
    And, transf.: exerceamur ad palum: et, ne imparatos fortuna deprehendat, fiat nobis paupertas familiaris, Sen. Ep. 18, 6.
    In the lang. of gladiators, palus primus or palusprimus (called also machaera Herculeana, Capitol. Pert. 8), a gladiator’s sword of wood, borne by the secutores, whence their leader was also called primus palus, Lampr. Commod. 15; Inscr. Marin. Fratr. Arv. p. 694.
    Prov.: quasi palo pectus tundor, of one astonished, stunned, Plaut. Rud. 5, 2, 2.
  2. II. Transf., = membrum virile, Hor. S. 1, 8, 5.