From Proto-Italic *-klom by long distance dissimilation of /l..l/ > /l...r/. Ultimately from Proto-Indo-European *-tlom. Although the Proto-Indo-European suffix had a variant with *r (*-trom, the ancestor of Latin -trum), the /k/ in -crum indicates that it comes from *tlom, since Proto-Indo-European *t was regularly changed to *k in Italic before *l, but not before *r. Based on the form of Umbrian ehvelklu 'decretum', the dissimilation to /r/ that created the form -crum postdates Proto-Italic.[1] Compare -āris, a dissimilated allomorph of -ālis.
-crum n (genitive -crī); second declension
Second-declension noun (neuter).
singular | plural | |
---|---|---|
nominative | -crum | -cra |
genitive | -crī | -crōrum |
dative | -crō | -crīs |
accusative | -crum | -cra |
ablative | -crō | -crīs |
vocative | -crum | -cra |