Relating to or characterized by a pleasant or agreeable sound; relating to euphony.
From 'euphony' + the suffix '-etic' (relating to). This adjectival form emerged in linguistic contexts to describe phonetic or sound-based phenomena that are aesthetically pleasing.
English spelling is notoriously non-euphonetic (try pronouncing 'colonel' or 'worcestershire'), which is why linguists sometimes argue English would benefit from spelling reform—making the written word match the good sounds we actually make.
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