Words for heat, warmth and related words in Celtic languages.

Flaming torches

Proto-Celtic *texstus = heat
Old Irish (Goídelc) tess = heat, warmth
Irish (Gaeilge) teas [tʲasˠ/tʲæsˠ] = heat, hotness, warmth; warm clothing, warm place; degree of hotness; high temperature, feverishness; ardour, passion; hottest, highest, stage
teasach = feverish heat, fever
teasaí = hot, warm; ardent, passionate; hot feverish; hot-tempered, fiery
teasaíocht = heat, warmth; ardour, passion; feverishness; hot temper, fire
teasaire = heater
Scottish Gaelic (Gàidhlig) teas [tʲes] = heat, hotness; temperature; heating (in metallurgy)
teas-mheidh = thermometer
teasach = fever, restlessness (caused by heat), mo(u)lt; thermal
teasadair / teasraiche / teasachan = heater
Manx (Gaelg) çhiass = heat, warmth
çhiassveih = thermometer
çhiasseyder = radiator, heater, warmer
çhiassid = hotness, temperature
çhiassagh = febrile, feverish
Proto-Brythonic tes = heat, warmth
Middle Welsh (Kymraec) tes = heat, warmth
Welsh (Cymraeg) tes [teːs] = heat (of the sun), warmth, (period of) warm weather, sunshine, (heat) haze, mist
cynes [ˈkənɛs] = warm (from cyn (co-) and tes)
tesaint = passion, zeal; heat, warmth
teser = (heat) haze
tesiad = a warming
tesio, tesiaf = to shine (of the sun)
tesog = hot, sunny, close sultry
Old Cornish tes = heat
Cornish (Kernewek) tes = heat
tesa = to heat
tesek = hot
tesel = thermal
Old Breton tes = heat
Breton (Brezhoneg) tes = heat

Etymology: from the Proto-Indo-European *tep- (to be warm, to be hot) [source]. Celtic words from fire come from the same PIE root via the Proto-Celtic *teɸnets (fire) [source]

The English word tepid comes from the same PIE root [source].

Proto-Celtic *teɸents = heat
Old Irish (Goídelc) té, tee [tʲeː] = hot, warm; lustful, wanton; comfortable, sheltered; fervent; fierce, keen
Irish (Gaeilge) te [tʲɛ] = hot, warm; pungent; ardent, hot-tempered, vehement, hotfoot; affectionate, comfortable
teobhlasta = hot (spicy)
teochroí = warm-heartedness, warmth, affection
strong>teochroíoch= warm-hearted
strong>teocht = warmth, heat, temperature
strong>teofholach= warm-blooded
alathe = lukewarm
téamh = heating, warming, distillation
Scottish Gaelic (Gàidhlig) teth [tʲeh] = hot
ain-teth = scorching, exceedingly hot, ardent, vehement, eager, inflamed
Manx (Gaelg) çheh = fevered, fervent, heated, hot, impassioned, passion, sexually precocious, thermal, warm
çhiow = to warm up, warm, warming up, inclined, yearned, heat,warmed

Etymology from the Proto-Indo-European *tep- (to be warm) [source].

Proto-Celtic *gʷrensos, *gʷrīnnso- = heat
Old Irish (Goídelc) grís = heat (of the sun), fire, embers
Middle Irish (Goídelc) grís, gríss = heat, fire, embers, hot ashes; glow, ardour, valour, passion
Irish (Gaeilge) gríos [ɡɾʲɪsˠ] = hot ashes, embers; heat, glow, ardour; rash, blotches (on skin)
gríosach = glowing
gríosóg = spark from embers, inflamed spot, rash
gríosóir = inciter, agitator
gríostaitneamh = burning, rosy, glow
gríosú = inflammation, incitement, stimulation
Scottish Gaelic (Gàidhlig) grìos [grʲiːs] = begging, entreaty; heat, embers, redness, inflammation, provocation
grìosad [grʲiəsəd] = begging, beseeching, entreating, cursing, swearing, stirring up a fire, provoking
Manx (Gaelg) gree [ɡriː] = heat
greeshagh = arouse (passions), arousing, vibrant, ember
greeshaghey = to aggravate, chivvy, set on, whip up, arouse (passions)
Welsh (Cymraeg) gwres [ɡwreːs] = heat, warmth, hot weather, feverishness, itching; intensity (of feeling), passion, lust, vehemence, ardour, fervour, zeal, enthusiasm
gwresâf, gwresáu = to heat, warm
gwresio, gwresu = to become heated, heat, generate heat, emit warmth
gwresog = hot, very warm, summery, heat-giving, calorific
gwresogi = to make warm or hot, provide warmth, heat
Middle Cornish gwres = heat
Breton (Brezhoneg) gwrez = heat, temperature, ardent, fervent, blazing
gwrezus = calorific
gwrezverk = temperature

Etymology possibly from the Proto-Indo-European *gʷʰer- (warm, hot) [source].

English words from the same PIE root include furnace, gore, thermal and warm [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary, Teanglann.ie, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Gerlyvyr Cernewec, Dictionaire Favereau, TermOfis, Le dictionnaire diachronique du breton, Geriafurch, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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