Possibly sanctus (“holy”) + -ārium (improperly for an adjective), via *sanctuārius, (relating to sanctity). But the u, which is unexpected for the second declension, makes this doubtful. The Late Latin noun sanctus post-dates sanctuārium by several centuries.
sānctuārium n (genitive sānctuāriī or sānctuārī); second declension
Second-declension noun (neuter).
singular | plural | |
---|---|---|
nominative | sānctuārium | sānctuāria |
genitive | sānctuāriī sānctuārī1 |
sānctuāriōrum |
dative | sānctuāriō | sānctuāriīs |
accusative | sānctuārium | sānctuāria |
ablative | sānctuāriō | sānctuāriīs |
vocative | sānctuārium | sānctuāria |
1Found in older Latin (until the Augustan Age).