From prōmptus (“readiness”) + -ārium (of purpose), via *promptuārius. The u in the spelling is due to the fourth declension noun.
prōmptuārium n (genitive prōmptuāriī or prōmptuārī); second declension
Second-declension noun (neuter).
singular | plural | |
---|---|---|
nominative | prōmptuārium | prōmptuāria |
genitive | prōmptuāriī prōmptuārī1 |
prōmptuāriōrum |
dative | prōmptuāriō | prōmptuāriīs |
accusative | prōmptuārium | prōmptuāria |
ablative | prōmptuāriō | prōmptuāriīs |
vocative | prōmptuārium | prōmptuāria |
1Found in older Latin (until the Augustan Age).