Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
imbrĭcus, a, um, adj. [imber], rainy (ante- and post-class.): Auster, rain-bringing, Plaut. Merc. 5, 2, 35: solstitium (opp. hiems serena), Macr. S. 5, 20, 14: imbrica tempestate pluviam videtur significare, Paul. ex Fest. p. 109 Müll.