Lewis & Short

compunctĭo, ōnis, f. [compungo].

  1. I. Lit., a puncture: ligni, Ambros. in Psa. 118, Serm. 3, § 8.
  2. II. Trop., the sting of conscience, remorse (eccl. Lat.), Salv. adv. Avar. 4, 8 al.