Lewis & Short

prae-dūro, āvi, ātum, 1, v. a.

  1. I. Lit., to make very hard, harden very much (postAug.): sucus praeduratus, Plin. 23, 7, 71, § 139; Apic. 6, 9; 7, 4; 8.
  2. II. Trop., to harden, indurate, Prud. στεφ. 5, 177.