Lewis & Short

căthē̆drārĭus, a, um, adj. [cathedra],

  1. I. of or pertaining to an arm-chair: subsellia, Dig. 33, 10, 5: servi, who carry a chair, Sid. Ep. 1, 11.
  2. II. Esp., pertaining to the chair or office of a teacher: philosophi, teachers, Sen. Brev. Vit. 10, 1; cf. cathedra, II.; so, oratores, Sid. Ep. 4, 3.