Lewis & Short

parmŭla, ae, f. dim. [1. parma], a little, round shield, a small target.

  1. I. Lit.: relictā non bene parmulā, Hor. C. 2, 7, 10; Fest. p. 238 Müll.
  2. II. Trop.: parmulam ventilare, Front. Or. Ep. 1 Mai.