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“frost” in Latin

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

frost
gelu (cold, as causing things to freeze, only used in the ablative): gelatio (the frost, inasmuch as it penetrates the soil, etc.): gelicidium (the frost, inasmuch as it turns liquids into ice): frigora, um (frost or frosty weather). To suffer from frost, gelicidio infestari (of plants, etc.): that cannot bear the frost, frigoris impatiens: algoris non patiens: not to be able to bear the frost, frigora non facile tolerare: to be able to bear frost, algoris patientem esse: to be stiff from frost, frigore rigere (of the soil); gelu torpere (to be benumbed, of persons): a severe frost followed, magna gelatio consecuta est: to leave anything exposed to the frost, rem relinquere ad gelicidium retectam (Varr., R.R., 1, 52, 2).
Hoar-frost, Vid: FROST-BITTEN, gelu rigens (Phaedrus, of a snake): praerigens (Tac.): His hands were so frost-bitten, that they actually fell off, ita praeriguere (militis) manus, ut truncis brachiis deciderent (Tac., Ann., 13, 35, 4).

Quick answer

What is the Latin word for frost?
The usual Latin words for “frost” are gelū̆, gĕlātĭo, gelicidium; also frīgus. 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.