Voiceless dental and alveolar trills

Common card · No. 335664

Voiceless dental and alveolar trills are a type of consonantal sound. They differ from their cognate /r/ only by the vibrations of the vocal cord. It occurs in a few languages, usually alongside the voiced version, as a similar phoneme or an allophone. Proto-Indo-European *sr developed into a sound written as ⟨ῥ⟩, with the letter for /r/ and the diacritic for /h/, in Ancient Greek. It was probably a voiceless alveolar trill and became the regular word-initial allophone of /r/ in standard Attic Greek that has disappeared in Modern Greek. *Proto-Indo-European *srew- > Ancient Greek ῥέω "flow", possibly [r̥é.ɔː]

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