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“thunder” in Latin

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

thunder s.
tonitrus, -ūs (in the plur., also, tonitrua; but no where the sing. tonitrum; Vid: Ramshorn, § 30, 5): fulmen (flash of lightning with thunder; also, figuratively, verborum fulmina): fragor (a crash, peal; e.g., fragor caeli or coelestis). The thunder of artillery, *tormentorum fragores: thunder of eloquence, sonitus (☞ Cic., Att., 1, 14, 4): the thunder of the Vatican, fulmen pontificale (after Liv., 6, 39, fulmen dictatorium): to hurl the thunder of the Vatican at anybody, *fulmine pontificali aliquem percellere.
thunder v.
tonare: intonare (both impersonal, transitive or intransitive, PROP. or figuratively; tonare as intransitive, intonare as transitive, of a powerful speaker). It thunders incessantly, continuus caeli fragor est: to be afraid when it thunders, tonitrua expavescere: a thundering speech, oratio fulgurans ac tonans (after Quint., 2, 16, 19); verborum fulmina (Cic., Fam., 9, 21, 1).

Quick answer

What is the Latin word for thunder?
The usual Latin words for “thunder” are tonitrus, fulmen, fragor; also tonitruum, caelestis, sonō. 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.