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Some languages possess a voiceless alveolar trill, which differs only in the vibrations of the vocal cord. This is rare, and usually occurs alongside the voiced version as a similar phoneme or an allophone. Proto-Indo-European developed into a sound spelled , with the letter for and the diacritic for , in Ancient Greek. It was probably a voiceless alveolar trill, and became the regular word-initial allophone of in standard Attic Greek. This allophone has disappeared in Modern Greek. *PIE > Ancient Greek ῥέω "flow" — possibly ==Features== Features of the voiceless alveolar trill: *Its place of articulation is dental, alveolar or post-alveolar, which means it is articulated behind upper front teeth, at the alveolar ridge or behind the alveolar ridge. It is most often apical, which means that it is pronounced with the tip of the tongue. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「voiceless alveolar trill」の詳細全文を読む スポンサード リンク
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