Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
pastillum, i, n. [pastillus], a little loaf or roll of bread, Varr. ap. Charis. p. 24 P.; a little round loaf for offering: pastillum in sacris libi genus rotundi, Paul. ex Fest. p. 250 Müll.