Lewis & Short

pĭlŭla, ae, f. dim. [3. pila], a little ball, globule.

  1. I. In gen., Plin. 16, 7, 10, § 28; Pelag. Vet. 14.
  2. II. In partic., in medicine, a pill, Plin. 28, 9, 37, § 138.