| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| NYI |
| NYI | ved. dáhati ‘verbrennt (tr.)’ | NYI | .. | LIV TOL |
| NYI | ved. adhāk ‘verbrannte (tr.)’ | NYI | .. | LIV TOL |
| NYI | [ved. kṣā́yati, pāli jhāyati ‘brennt’{6} | NYI | .. | LIV TOL |
| NYI | ved. (Br.) dadā́ha ‘verbrannte (tr.)’ | NYI | .. | LIV TOL |
| NYI | jav. dažaiti ‘verbrennt (tr.)’ | NYI | .. | LIV TOL |
| NYI | lit. degù, (dègti) ‘brennen; anzünden, verbrennen’{1} | NYI | .. | LIV TOL |
| NYI | aksl. (+) žegǫ, (žešti) ‘brennen; anzünden, verbrennen’{2} | NYI | .. | LIV TOL |
| NYI | aksl. -žašę ‘(ver)brannten’ | NYI | .. | LIV TOL |
| NYI | alb. djeg ‘verbrennt (tr.)’ | NYI | .. | LIV TOL |
| NYI | alb. n-dez ‘zündet an’{5} | NYI | .. | LIV TOL |
| NYI | ?[toch. Konj. III B 1s Med. tskemar ‘soll brennen’, A Abstr. tskalune{3} | NYI | .. | LIV TOL |
| NYI | toch.B 3p tsekär ‘verbrannten (tr.)’, 1s Med. tseksamai ‘bin verbrannt worden’{3} | NYI | .. | LIV TOL |
| NYI | toch.A 3s Akt. tskäṣ, B tsakṣäṃ ‘verbrennt (tr.)’, 3s Med. tskaṣtär ‘verbrennt (intr.)’ | NYI | .. | LIV TOL |
| NYI | ?##toch.A Prät. 3s Med. tsakät ‘verbrannte (intr.)’{7} | NYI | .. | LIV TOL |
| NYI | lat. foueō, -ēre ‘wärmen, hegen’ | NYI | .. | LIV TOL |
| NYI | ?mkymr. deifyaw ‘(ver)sengen’{4} | NYI | .. | LIV TOL |
| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| Celtic |
| Old Irish | daig | fire | n | GED LRC |
| Old Irish | dega | fire | n.gen | GED LRC |
| Middle Irish | daig | fire | n | RPN LRC |
| English |
| Middle English | fomenten | to foment | vb | W7 LRC |
| English | febrile | feverish | adj | LRC |
| English | fever | high body temperature (indicating illness) | n | LRC |
| English | foment | to bathe with warm water/medicated liquid | vb.trans | AHD W7 LRC |
| English | fomite | pathogen-carrying object | n | AHD LRC |
| English | tephra | solids ejected into air by erupting volcano | n | AHD LRC |
| West Germanic |
| German | Fieber | fever | n.neut | TLL LRC |
| North Germanic |
| Danish | feber | fever | n | TLL LRC |
| Swedish | feber | fever | n | TLL LRC |
| Italic |
| Latin | favīlla | embers, hot ashes | n.fem | GED LRC |
| Latin | febrilis | febrile | adj | LRC |
| Latin | febris | fever | n | RPN LRC |
| Latin | fomentum | fomentation | n.neut | W7 LRC |
| Latin | foveō, fovēre, fōvī, fōtum | to favor, cherish, warm up | vb | GED LRC |
| Late Latin | fomento, fomentāre | to prepare, conspire | vb | W7 LRC |
| Portuguese | febre | fever | n | TLL LRC |
| Spanish | fiebre | fever | n | TLL LRC |
| French | fièvre | fever | n | TLL LRC |
| Italian | febbre | fever | n | TLL LRC |
| Balto-Slavic |
| Old Prussian | dagis | summer | n | GED LRC |
| Lithuanian | dãgas, dagà | heat, sultry harvest time | n | GED LRC |
| Lithuanian | degù, dègti | to burn | vb | RPN LRC |
| Latvian | dęgu | to burn | vb | GED LRC |
| Old Church Slavonic | žegǫ, žešti | to burn, ignite | vb | RPN LRC |
| Paleo-Balkan |
| Albanian | djeg | to burn up | vb | GED LRC |
| Hellenic |
| Ionic | τέφρη | (burning) ashes | n | RPN LRC |
| Greek | τέφρα | ashes, tephra | n | GED LRC |
| Indo-Iranian |
| Avestan | dažaiti | to burn | vb | RPN LRC |
| Sanskrit | dáhati | to burn, consume by fire | vb | GED LRC |
| Sanskrit | dāhas | heat, burning | n | GED LRC |
| Sanskrit | ni-dāghás | heat, summer | n | GED LRC |
| Pali | dahati | to burn, roast | vb | RPN LRC |
| Pali | dahana- | fire, burning | n | RPN LRC |
| Hindi | dahnā | to burn, be burnt | vb | RPN LRC |
| Sindhi | da(h)o | sun, strong light of fire | n | RPN LRC |
| Tocharian |
| Tocharian B | tsäk- | to burn (up) | vb | RPN LRC |
| Tocharian A | tsāk- | to shine, give light | vb | RPN LRC |
| Tocharian A | tsäk- | to burn | vb | GED LRC |