Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dēcermĭna, um, n. [decerpo], leaves and boughs plucked off; decermina dicuntur quae decerpuntur purgandi causa, Paul. ex Fest. p. 72, 7 Müll.; hence Trop.: Fortunae, i. e. beggars, qs. the refuse of Fortune, App. M. 1, p. 104, 29.