Lewis & Short

sellārĭa, ae, f. [sella],

  1. I. a room furnished with seats or settles; a sitting-room, drawing-room, Plin. 34, 8, 19, § 84; 36, 15, 24, § 111; used by Tiberius for debauchery, Suet. Tib. 43; cf. sellarius.
  2. II. A public courtesan, Vet. Schol. Juv. 3, 136.