Lewis & Short

cōtĭcŭla, ae, f. dim. [cos].

  1. I. A small touchstone, a test, βάσανος, Plin. 33, 8, 43, § 126.
  2. II. A small stone mortar for medical use, Plin. 31, 9, 45, § 100; cf. Isid. Orig. 4, 11, 7.