[b]→[v]Certainty: 5/5Commonality: 5/5
Voiced bilabial plosive to Voiced labiodental fricative
The shift from the bilabial stop [b] to the labiodental (or bilabial) fricative [v] or approximant [β] is a classic instance of spirantization (lenition). It is especially common in intervocalic position, where the oral closure weakens. In Spanish, this merged with the reflex of Latin /v/ (originally [w]) to produce a single phoneme realized as [b] word-initially and [β] elsewhere.
Phonetic Effects
Language Examples
kātab [b]→kātav [v]— Begedkefat spirantization: post-vocalic /b/ → [v] in Biblical Hebrew. E.g., כָּתַב 'katav' (he wrote).
habēre (Latin)→haber [aβer]— Intervocalic Latin /b/ spirantized to [β]; also illustrates betacism (merger of /b/ and /v/).
Old Persian naiba- [b] (beautiful)→Middle Persian nēw [w]— Intervocalic lenition in Middle Persian: /b/ after a vowel shifted to the approximant [w] (sometimes transcribed as /v/). The process began in the Arsacid period and was fully established in Sassanid-era Middle Persian (3rd–7th c. CE).
Old Persian asabāra- [b] (horseman)→Middle Persian asvār— Intervocalic /b/ → /w/ ~ /v/; the word shows the characteristic Iranian weakening of voiced stops between vowels.
Old Iranian /b/ (all positions)→Sogdian /β/ (fricative)— Sogdian underwent spirantization of voiced stops more radically than Persian: /b/ → [β] in all positions including word-initially (not just intervocalically). This Eastern Iranian feature distinguished Sogdian from Middle Persian.
abrid [b] (road)→[aβrid] (spirantized)— Kabyle spirantization: lax /b/ in intervocalic position weakens to the voiced bilabial fricative [β], approaching [v] in some realizations. Geminate /bb/ and post-nasal /mb/ resist spirantization and surface as stops.
amghar [stop b in compounds]→[β] in intervocalic environment— Northern Berber spirantization rule: lax (non-geminate) /b/ between vowels or sonorants → [β]. Absent in Zenaga and Tetserret (non-spirantizing Berber branches).
Related Transformations
More Semitic Shifts
Sources & References
- https://www.cambridge.org/core/books/history-of-the-spanish-language/03501B0EC536AC346B59BFAF6BC5E89E
- https://en.wikipedia.org/wiki/Middle_Persian
- Skjærvø, P. O. (2009). Middle Persian. In Windfuhr (ed.), The Iranian Languages. Routledge.
- https://en.wikipedia.org/wiki/Kabyle_language
- Kossmann, M. G. & Stroomer, H. J. (1997). Berber Phonology. In Kaye (ed.), Phonologies of Asia and Africa. Eisenbrauns.
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