Lewis & Short

cŏrĭārĭus, a, um, adj. [corium],

  1. I. of or pertaining to leather frutex, i. e. useful for tanning leather, Plin. 24, 11, 54, § 91.
    Hence,
  2. II. Subst.: cŏrĭārĭus, ii, m., a tanner, currier, Plin. 17, 9, 6, § 51; Inscr. Orell. 4074 al.