| 1 | Latin | sublingualis | — |
| 2 | Latin | linguālis | — |
| 3 | Latin | lingua | tongue; a speech; an utterance or expression |
| 4 | Latin | -ula | regō + API → rēgula; tegō + API → tēgula;... |
| 5 | Proto-Indo-European | -tlom | Alternative form of *-trom |
| 6 | Proto-Indo-European | -trom | Forms nouns denoting a tool or instrument |
| 7 | Proto-Indo-European | -tḗr | Derives agent nouns from verbs, denoting someone... |