Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
lōrīcŭla, ae, f. dim. [lorica], a small breastplate; hence, transf., a small breastwork: quorum frontes viminea loricula munirentur, Hirt. B. G. 8, 9, 3: loricula urbem esse circumdatam, Veg. Mil. 4, 28.