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etymon (n.)

"primitive word," 1570s, from Greek etymon, neuter of etymos "true, real, actual" (see etymology). Classical Greek used etymon as an adverb, "truly, really." Related: Etymic.

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Definitions of etymon from WordNet

etymon (n.)
a simple form inferred as the common basis from which related words in several languages can be derived by linguistic processes;
Synonyms: root
From wordnet.princeton.edu