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 *(e)rd-, which is the etymon of Latin cor, Greek kardía, Russian serdtse, and English heart.
Origin: 1560–70; < L: the origin of a word < Gk étymon the essential meaning of a word seen in its origin or traced to its grammatical parts (neut. of étymos true, actual, real)
et·y·mon (ět'ə-mŏn') n.
pl.et·y·mons or et·y·ma (-mə)
An earlier form of a word in the same language or in an ancestor language. For example, Indo-European *duwo and Old English twā are etymons of Modern English two.
A word or morpheme from which compounds and derivatives are formed.
A foreign word from which a particular loan word is derived. For example, Latin duo, "two," is an etymon of English duodecimal.
[Latin, from Greek etumon, true sense of a word, from neuter of etumos, true.]