From aculeus + -ō(nis), with /ū/ taken from acūtus (“sharp”). Documented in the Reichenau Glossary.
The nominative singular would have ended in -ō in Classical Latin. The ending -ōnis reflects a Gallo-Romance remodelling according to other inflections, for instance the accusative singular -ōnem. Compare the nominative singular pedis, standing for Classical Latin pēs in the aforementioned glossary.
acūleōnis m (genitive acūleōnis); third declension (Early Medieval Latin)
Third-declension noun (i-stem).
singular | plural | |
---|---|---|
nominative | acūleōnis | acūleōnēs |
genitive | acūleōnis | acūleōnium |
dative | acūleōnī | acūleōnibus |
accusative | acūleōnem | acūleōnēs acūleōnīs |
ablative | acūleōne | acūleōnibus |
vocative | acūleōnis | acūleōnēs |