Significatio vocis -culum | Babel Free

Definitiones

1. nominative/accusative/vocative neuter singular
   accusative, form-of, morpheme, neuter, nominative, singular, vocative
2. suffix used to derive nouns from verbs, particularly nouns for tools and instruments
   declension-2, morpheme, neuter
3. accusative masculine singular
   accusative, form-of, masculine, morpheme, singular

Exempla

“prōpugnō, prōpugnāre (“to fight for⟳, defend”) + -culum → prōpugnāculum (“bulwark, fortress, protection”)”

“dēvertō, dēvertere (“to turn aside, turn away; to lodge”) + -culum → dēverticulum (“byroad; digression; lodging; refuge”)”

Gradus CEFR