| 1 | German | Lackmus | litmus |
| 2 | Dutch | lakmoes | litmus |
| 3 | Dutch | lak | lacquer; foolery, foolishness, nonsense;... |
| 4 | French | laqué | past participle of laquer; glazed |
| 5 | Middle French | lache | — |
| 6 | Omani Arabic | لك | — |
| 7 | Persian | لاک | — |
| 8 | Urdu | لاکھ | lakh, lac |
| 9 | Maharastri Prakrit | 𑀮𑀓𑁆𑀔 | — |
| 10 | Sanskrit | लक्ष | a mark, sign, token; a mark to aim at, target,... |
| 11 | Sanskrit | लक्ष् | perceive, observe; recognise; to mark, sign |
| 12 | Sanskrit | रक्ष् | to protect, guard, watch, take care of, save,... |
| 13 | Proto-Indo-Aryan | Hrakṣ- | — |
| 14 | Proto-Indo-Iranian | Hrakš- | — |
| 15 | Proto-Indo-European | h₂lek- | to protect |