[d]→[ð]Certainty: 5/5Commonality: 5/5
Voiced alveolar plosive to Voiced dental fricative
The shift from the voiced alveolar/dental stop [d] to the voiced dental fricative [ð] is a textbook example of spirantization and lenition. It occurs very frequently when the stop is placed between two vowels, causing it to weaken and allow continuous airflow.
Phonetic Effects
Language Examples
yad [d] (hand)→[jaːð]— Begedkefat spirantization: post-vocalic /d/ → [ð] in Biblical Hebrew and Aramaic. The shift produced the historical dālet/ḏālet distinction.
dado [d]→[ˈdaðo]— Intervocalic /d/ spirantizes to the voiced dental approximant [ð̞] in all Spanish dialects.
d (initial)→dh [ð] → [ɣ]— Grammatical lenition (séimhiú): /d/ → [ð] in Old Irish, which further shifted to [ɣ] in most modern Goidelic environments.
Old Persian /d/ after vowels→[ð] (voiced dental fricative)— In archaic Persian (up to the Mongolian era), /d/ spirantized to [ð] in post-vocalic position, producing the allophone [ð] beside underlying /d/. Early New Persian manuscripts record this variation. By the 13th century, [ð] reverted to [d] in most dialects.
Old Iranian /d/ (all positions)→Sogdian /ḏ/ ~ [ð]— Sogdian spirantized inherited /d/ to [ð] in all positions, including word-initially — a more thoroughgoing spirantization than Persian, which limited the shift to post-vocalic environments.
adif [d] (marrow)→[aðif] (spirantized)— Kabyle spirantization: lax /d/ in intervocalic position weakens to the voiced dental fricative [ð]. Geminate /dd/ and post-nasal /nd/ resist spirantization. Kabyle is classified as a 'spirantizing' Berber language, contrasting with non-spirantizing varieties like Zenaga.
/d/ in intervocalic or post-vocalic position→[ð]— Middle Atlas Tamazight dialects (Ayt Ndhir area) show the same spirantization pattern as Kabyle: lax /d/ → [ð] in weak prosodic positions. Tense /dː/ and post-sonorant /nd/ remain as stops.
Related Transformations
More Romance Shifts
Sources & References
- https://www.cambridge.org/core/books/history-of-the-spanish-language/03501B0EC536AC346B59BFAF6BC5E89E
- https://en.wikipedia.org/wiki/Lenition
- https://www.britannica.com/topic/Iranian-languages/Characteristics-of-the-Iranian-languages
- Skjærvø, P. O. (2009). Middle Persian. In Windfuhr (ed.), The Iranian Languages. Routledge.
- Kossmann, M. G. & Stroomer, H. J. (1997). Berber Phonology. In Kaye (ed.), Phonologies of Asia and Africa. Eisenbrauns.
- https://en.wikipedia.org/wiki/Kabyle_language
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