| 1 | Portuguese | lavrador | farmer; husbandman; ploughman |
| 2 | Old Portuguese | lavrador | — |
| 3 | Latin | labōrātor | — |
| 4 | French | laboratoire | laboratory |
| 5 | Medieval Latin | laboratorium | laboratory |
| 6 | Latin | labotatorius | laborable |
| 7 | Latin | laborator | plowman, tiller of the soil |
| 8 | Latin | laboratus | produced, having been produced |
| 9 | Latin | laboro | I toil, labor; I endeavor, strive; I suffer, am... |
| 10 | Latin | labor | work; labour, toil; hardship, trouble, fatigue,... |
| 11 | Old Latin | labos | — |
| 12 | Romanian | labă | palm; paw |
| 13 | Hungarian | láb | leg; foot; support, stand |
| 14 | Proto-Uralic | luwe | bone |
| 15 | Proto-Iranian | *Hrawpācáh | — |
| 16 | Proto-Indo-Iranian | *Hrawpāćás | — |