Lewis & Short

tĕrē̆brātĭo, ōnis, f [id.], a boring.

  1. I. Lit., Col. 4, 29, 13; 5, 11, 12; id. Arb. 26.
  2. II. Transf., concr., a hole bored, a bore, Vitr. 9, 9 med.; 10, 13