Déclinaison / Conjugueur latin
| SINGULIER |
| Nom. | Lethaeus |
| Gen. | Lethaei |
| Dat. | Lethaeo |
| Acc. | Lethaeum |
| Abl. | Lethaeo |
| Voc. | Lethaee |
| PLURIEL |
| Nom. | Lethaei |
| Gen. | Lethaeōrum |
| Dat. | Lethaeis |
| Acc. | Lethaeos |
| Abl. | Lethaeis |
| Voc. | Lethaei |
| SINGULIER |
| Nom. | Lethaeă |
| Gen. | Lethaeae |
| Dat. | Lethaeae |
| Acc. | Lethaeam |
| Abl. | Lethaeā |
| Voc. | Lethaeă |
| PLURIEL |
| Nom. | Lethaeae |
| Gen. | Lethaeārum |
| Dat. | Lethaeis |
| Acc. | Lethaeas |
| Abl. | Lethaeis |
| Voc. | Lethaeae |
| SINGULIER |
| Nom. | Lethaeum |
| Gen. | Lethaei |
| Dat. | Lethaeo |
| Acc. | Lethaeum |
| Abl. | Lethaeo |
| Voc. | Lethaeum |
| PLURIEL |
| Nom. | Lethaea |
| Gen. | Lethaeōrum |
| Dat. | Lethaeis |
| Acc. | Lethaea |
| Abl. | Lethaeis | |