In linguistics, a vowel or diphthong that lacks clear articulation or definition, or a phoneme that is difficult to distinguish from other sounds.
From Greek aphthongos (voiceless, soundless) composed of a- (without) + phone (sound) + -ong. Despite its form, this is a specialized linguistic term rather than a common word.
This word reveals that ancient Greeks had concepts for the idea of 'unclear speech sounds' thousands of years before modern phonetics was invented—they were acute observers of language structure!
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