Lewis Short
arcŭla (noun F) : dim.arca
* A small chest or box, a casket, etc.
* For unguents, ornaments, etc.
* 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.
* The wind-box of an organ, Vitr. 10, 13.
* Arcula dicebatur avis, quae in auspiciis vetabat aliquid fieri, Paul. ex Fest. p. 16 Müll.
Charlton T. Lewis, Charles Short, A Latin Dictionary