adjectivefirst/second-declension adjective
obsidiānus
obsidiānus (feminine obsidiāna, neuter obsidiānum)
Classical[ɔp.sɪ.diˈaː.nʊs]Ecclesiastical[ob.si.diˈaː.nus]
Meaning
- adjectiverelationalobsidian
Declension
| form | masculine | feminine | neuter |
|---|---|---|---|
| nominative | obsidiānus | obsidiāna | obsidiānum |
| genitive | obsidiānī | obsidiānae | obsidiānī |
| dative | obsidiānō | obsidiānae | obsidiānō |
| accusative | obsidiānum | obsidiānam | obsidiānum |
| ablative | obsidiānō | obsidiānā | obsidiānō |
| vocative | obsidiāne | obsidiāna | obsidiānum |
| form | masculine | feminine | neuter |
|---|---|---|---|
| nominative | obsidiānī | obsidiānae | obsidiāna |
| genitive | obsidiānōrum | obsidiānārum | obsidiānōrum |
| dative | obsidiānīs | obsidiānīs | obsidiānīs |
| accusative | obsidiānōs | obsidiānās | obsidiāna |
| ablative | obsidiānīs | obsidiānīs | obsidiānīs |
| vocative | obsidiānī | obsidiānae | obsidiāna |
Obsĭdĭānus, a false read. for Obsianus, Plin. 36, 26, 67, § 196; v. Obsius.
Origins
Named after Obsidius, who was, according to Pliny, the Roman who discovered the stone in Aethiopia. The more common nomen Obsius was used by Sillig, but the correct name was Obsidius. Both names are of Italic (Sabine/Samnite) origin and ultimately come from Proto-Italic *op(i)s, from Proto-Indo-European *h₃ep- (“to work, toil”) (compare the goddess Ops).