etymologyyoudaoicibaDictYouDict[etymology 词源字典]
etymology: [14] The underlying meaning of etymology is ‘finding the underlying or ‘true’ meaning of words’. Its ultimate source is Greek étumos ‘real, true’. From this was derived étumon ‘true or literal sense of a word’ (acquired by English in the 16th century as etymon). Postclassical grammarians came to use this in the sense ‘root from which a particular word was derived’, as a result of which modern etymology, the study of etymons, deals with their history rather than their meaning.
[etymology etymology, etymology origin, 英语词源]
etymology (n.)youdaoicibaDictYouDict
late 14c., ethimolegia "facts of the origin and development of a word," from Old French etimologie, ethimologie (14c., Modern French étymologie), from Latin etymologia, from Greek etymologia "analysis of a word to find its true origin," properly "study of the true sense (of a word)," with -logia "study of, a speaking of" (see -logy) + etymon "true sense," neuter of etymos "true, real, actual," related to eteos "true," which perhaps is cognate with Sanskrit satyah, Gothic sunjis, Old English soð "true."

Latinized by Cicero as veriloquium. In classical times, with reference to meanings; later, to histories. Classical etymologists, Christian and pagan, based their explanations on allegory and guesswork, lacking historical records as well as the scientific method to analyze them, and the discipline fell into disrepute that lasted a millennium. Flaubert ["Dictionary of Received Ideas"] wrote that the general view was that etymology was "the easiest thing in the world with the help of Latin and a little ingenuity."

As a modern branch of linguistic science treating of the origin and evolution of words, from 1640s. As "account of the particular history of a word" from mid-15c. Related: Etymological; etymologically.