Lewis & Short

arcŭla, ae, f. dim. [arca], a small chest or box, a casket, etc.

  1. I. For unguents, ornaments, etc.
    1. A. A small perfume-box, a jewel-casket, Plaut. Most. 1, 3, 91: arculae muliebres, Cic. Off. 2, 7, 25.
      Hence, trop. of rhetor. ornament: omnes (Isocratis) discipulorum arculae, Cic. Att. 2, 1.
    2. B. A small money-box or casket: arcula plena aranearum, Afran. ap. Fest. s. v. tanne, p. 154 (cf. Cat. 13, 8: Plenus sacculus est aranearum).
  2. II. The wind-box of an organ, Vitr. 10, 13.
  3. III. Arcula dicebatur avis, quae in auspiciis vetabat aliquid fieri, Paul. ex Fest. p. 16 Müll.