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“etymology” in Latin

The English word etymology itself goes back to Latin etymologia.

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

etymology
(1) (1) The derivation of a word, origo; etymon (the true explanation and meaning of a word by virtue of its derivation; Varr., R.R., 1, 48, 2; Gell., 18, 4, extr., where, etyma vocum et origines). (2) The deriving of a word from a root, etymologia (the deriving and explaining of a word from its root, in Cic., Top., 8, 35, litterally translated by veriloquium, to which, however, he himself would prefer notatio): originatio (derivation, but only as a term recommended by some; Vid: Quint., 1, 6, 28): enodatio nominum (the development of nouns; Cic., Top., 7, 31; N.D., 3, 24, 62). (3) As a science, etymologice (Varr., L.L., 7, 1, §4): etymologia: verborum explicatio... quam [Stoici] etymologiam appellabant (Cic., Acad., 1, 8, 32; he defines it to be the explaining qua de causa quaeque essent nominata).

Quick answer

What is the Latin word for etymology?
The usual Latin words for “etymology” are orīgō, etymon, etymologia; also ŏrīgĭnātĭo, etymologicus, quī. 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.