Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
orcŭla, ae, f. dim. [1. orca], a small tun, a cask (ante- and post-class.): oleas in orculam calcato manibus siccis, Cato, R. R. 117; Auct. de Limit. p. 253 Goes.