the linguistic form from which another form is historically derived, as the Latin cor “heart,” which is the etymon of English cordial, or the Indo-European *ḱ(e)rd-, which is the etymon of Latin cor, Greek kardía, Russian serdtse, and English heart.
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How to use etymon in a sentence
The old French vairon signifies anything of two colours, and may possibly be the etymon of vaire.The Curiosities of Heraldry | Mark Antony Lower
I cannot admit any of these derivations, though perhaps my own etymon may not be deemed less irrelevant, viz.The Curiosities of Heraldry | Mark Antony Lower
Were, wert; worth, werth; word and werde, are derived from the same etymon and retain a similarity of meaning.Lectures on Language | William S. Balch
I am inclined to think, with the two first-mentioned lexicographers, that the etymon is πόσις, or potio.
Will you accept a French elucidation of the etymon of this word, which has sorely puzzled your correspondents?
British Dictionary definitions for etymon
a form of a word or morpheme, usually the earliest recorded form or a reconstructed form, from which another word or morpheme is derived: the etymon of English "ewe" is Indo-European " * owi"
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012