Lewis & Short

1. nĭtēla, ae, f. [niteo], brightness, splendor (post-class.).

  1. I. Lit.: armorum nitela, Sol. 22, 5.
  2. II. Transf.
    1. A. That which shines or glitters, a glittering particle: nitelae pulveris, gold-dust, Sol. 23, 4.
    2. B. That which causes to shine, a polish: nitelae oris, i. e. tooth-powder, Cat ap. App. Mag. p. 277, 5.