Lewis & Short

vernātĭo, ōnis, f. [verno], the sloughing or shedding of the skin of snakes.

  1. I. Lit., Plin. 29, 5, 32, § 101; 30, 3 8, § 24.
  2. II. Transf., concr., the slough cast off by a snake, Plin. 29, 6, 35, § 11.