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“ardor” in Latin

The English word ardor itself goes back to Latin āridus, through ardor.

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

ardor
PROPR. heat. IMPROPR., ardor, fervor, aestus (the first the weakest, the last the strongest: all three also with animi, when mental ardor is meant): impetus (impetuosity). Youthful ardor, ardor juvenilis; ardor or fervor aetatis.

Quick answer

What is the Latin word for ardor?
The usual Latin words for “ardor” are ārdor, fervor, aestus; also impetus. 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.