-bulum

• -brum, -bra (by dissimilation)
• -bula

From Proto-Indo-European *-dʰlom (“instrumental suffix”). Related to -trum.

Related to lat.-trum, -brum, -culum, from *-tro / *d^hro, *tlo- / *-d^hlo-, for Bartholomae's Law.

• (Classical Latin) IPA^(key): [bʊ.ɫũː]
• (modern Italianate Ecclesiastical) IPA^(key): [bu.lum] (stressed on the antepenult)

-bulum n (genitive -bulī); second declension

1. Nominal suffix denoting instrument.
2. Nominal suffix denoting vessel or place.
3. (rare) Nominal suffix denoting person.

Second-declension noun (neuter).