LATIN DICTIONARYLexicon Latīnum
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“warm” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

warm v.
Transitively, tepefacere (to make lukewarm): calefacere (to make hot): fovere (to warm by internal or animal heat). To warm one’s self, corpus calefacere or refovere: to warm one’s self at the fire, igni admoto artus refovere: to warm again, recalefacere (e.g., water): recoquere (to dress again; e.g., food). Warmed up cabbage, crambe repetita (Juv., 7, 154): warmed up again, hesternus (i. e., prepared for yesterday’s dinner e.g., soup warmed up again, jus hesternum): to keep meat warm (on hot plates), epulas fovere foculis ferventibus (on hot pans of coals).
Intransitively, calefieri, calescere; tepefieri, tepescere (PROP.); excandescere (figuratively).
warm adj.
PROP., calidus (the proper word; opposed to frigidus): tepidus (lukewarm): fervidus (very warm, hot): spissus (thick, and so promoting warmth; of clothing). A warm day, dies calidus: warm water, aqua calida, or, simply, calida, calda: a warm winter, hiems tepida: a warm bath, balneum calidum; calida (sing.); thermae (plur.): to be warm, calere: fervere, candere (to be very warm): it is warm (of the weather), calet aer; calida est tempestas: to grow warm, calescere, calefieri; also, (of the weather) incalescere.
Figuratively, calidus: acer: incitatus: intentus: intimus (of friendship, etc.). A warm imagination, calidior, acrior quaedam vis imaginandi: he is a very warm friend to me, illum habeo amicorum principem (Cic.): warm friendship, love, amicitia intima: amor intimus: there was warm work that day (in fighting), acriter, pertinaciter, magna virium contentione pugnatum est hoc die: to be a warm friend of liberty, or of one’s country, studiosissimum, amantissimum esse libertatis, salutis publicae.

Quick answer

What is the Latin word for warm?
The usual Latin words for “warm” are tepefaciō, calefaciō, foveō; also calēscō, tepēscō, excandēscō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.