Lewis & Short

grus, grŭis (also in the

  1. I. nom. sing. gruis, Phaedr. 1, 8, 7), f. (m., Hor. S. 2, 8, 87) [Gr. γέρανος, akin to γέρων], a crane, Plin. 10, 23, 30, § 60; Cic. N. D. 2, 49, 125; Mart. 13, 75; Cels. 2, 18; Lucr. 4, 181; regarded by the Romans as a delicacy, Hor. S. 2, 8, 87; Gell. 7, 16, 5; Stat. S. 4, 6, 8.
  2. II. Transf. (with reference to the form of a crane’s bill), a besieging machine, battering-ram, called also corvus, Vitr. 10, 19.