[θ]→[h]Certainty: 5/5Commonality: 4/5

Hellenic Uralic Debuccalization Lenition Celtic

Voiceless dental fricative to Voiceless glottal fricative

Debuccalization of the voiceless dental fricative [θ] to the glottal fricative [h] is a common step in the weakening of dental sounds across several language families, most notably in Ancient Greek and Finnish.

Phonetic Effects

Debuccalization, Lenition

Language Examples

Irish (Goidelic) Celtic

Old Irish [θ] (written 'th')→Modern Irish [h]— Lenited /t/ became [θ] in Primitive Irish and subsequently debuccalized to [h] by the Middle Irish period. Example: 'athair' (father) [ˈaθirʲ] → [ˈahirʲ].

Ancient Greek (Historical) Hellenic

Historical *θ (from *s)→[h]— Proto-Indo-European *s shifted to *θ and then debuccalized to [h] in word-initial position.

Finnish (Western Dialects) Uralic

metsä [ˈmeθæ]→[ˈmehtæ]— Historical interdental fricatives debuccalized to [h] in many Western and Eastern dialects.

Related Transformations

Reverse Complete loss Glottalization

More Lenition Shifts

[a] → [∅] — Elision [b] → [v] — Spirantization [tɕ] → [ʃ] — De-affrication [tɕ] → [ɕ] — Lenition [d] → [∅] — Elision

Sources & References

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