Lewis & Short

pastillus, i, m. dim. [panis],

  1. I. a little loaf or roll: pastillus forma panis parvi utique deminutivum est a pane, Paul. ex Fest. p. 222 Müll.
  2. II. Transf., medicine in the form of a round ball or cake, a lozenge, troche, trochisch, Plin. 22, 12, 14, § 29: emplastra pastillique, quos τροχίσκους Graeci vocant, Cels. 5, 17, 2; cf. id. 5, 20: sucum in sole coctum dividunt in pastillos, Plin. 13, 22, 43, § 126: digerere aliquid in pastillos, id. 12, 27, 60, § 131: in pastillos cogere, id. 20, 1, 2, § 3: densare in, id. 25, 13, 95, § 152: diluere in, id. 25, 12, 91. § 143.
    Also of aromatic lozenges, used to impart an agreeable smell to the breath: pastillos Rufillus olet, Hor. S. 1. 2, 27; 1, 4, 92; Mart. 1, 88, 2.