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As I learned it back in introductory Greek, there's significant debate in the classics community about whether Classical Greek Ζ was pronounced /dz/, /zd/, /zz/, or something else.

What evidence is there to favor one over another?

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W. Sidney Allen's famous Vox Graeca, which is well worth the time of anyone with a more-than-casual interest in Greek pronunciation, has three-and-a-half pages' worth of things to say about the subject, which I will attempt to summarise.

It's uncontroversial that from quite early in the Archaic period through the late 4th century BCE, ζ represented [zd] in every major dialect. Evidence for this:

  1. The combinations Ἀθήνας + δε, θύνας + δε are written Ἀθήναζε, θύναζε.
  2. In most dialects, including Attic, a nasal is regularly lost before fricative σ, so e.g. where the ν of συν is preserved in σύνδεσμος, it is lost in σύστασις. The same loss is found before ζ, e.g. σύζυξ, σύζῆν, and in πλάζω next to ἔπλαγξα, suggesting the sound following the nasal was a fricative.
  3. In some cases ζ derives from PIE *sd [zd], as in ὄζος < PIE *h₃ósdos (cf. German Ast), ἵζω < PIE *si-sd-oh₂ (cf. Latin sīdō, which instead lost the second s of the same form, with compensatory lengthening of the i). (n.b. Allen has forms without laryngeals here.)
  4. Up until the early 4th century, ζ is used to render Iranian zd, e.g. Ὠρομαζης = Auramazda (Plato), Ἀρταοζος = Artavazda (Xenophon).

However, before it was [zd], it was likely [dz], because:

  1. More often than deriving from PIE *sd, ζ continues PIE *dy or *gy, e.g. πεζός < PIE *ped-yos, ἅζομαι beside ἅγιος. These groups must have developed through an affricate stage [dʒ] > [dz] (cf. Latin medius > Italian mezzo) before becoming [zd] through metathesis.
  2. It's difficult to see why ζ would exist at all when σδ would do fine for [zd]. δσ is not a satisfactory representation of [dz], however, since voice assimilation is typically regressive rather than progressive in Greek.
  3. Forms of zeta are used with probable value [ts] in the Oscan and Umbrian alphabets, based on the Euboean Greek alphabet of ~700 BCE. It may have the same value in some early Cretan inscriptions.

The metathesis of [dz] into [zd] isn't rare and would be particularly natural in Greek, which didn't have any other affricates and also lacked an independent /z/ phoneme, but did already have [z] as a regular allophone of /s/ before voiced stops, as e.g. in Λέσβος [lézbos].

Later in the 4th century, ζ apparently began to represent [z], as evidenced by its being used to represent Persian z and occasional confusions between ζ and σ in inscriptions. When Aristotle said that some people would analyse ζ as σ + δ but others consider it a separate sound that does not comprise already recognised elements, he may have been referring to the start of this process. It's usually held [z] would more naturally develop out of [dz] than out of [zd], so it's been suggested this development is not a normal phonetic development but a dialectical replacement from the Koine (just as σσ replaced ττ). After short vowels at least the original quantitative pattern is likely to have been preserved by gemination, i.e. [zz]; this is also indicated by its representation as ss in the early Latin borrowing massa < Greek μάζα.

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  • Very interesting! At what point, then, would Aeolic /zd/ have gotten respelled into σδ? Sappho was writing well before Attic lost its /zd/, according to this, but of course the manuscripts we have are later. – Draconis Jul 9 at 16:09
  • @Draconis Are you asking because you know Vox Graeca talks about it and I omitted it? Allen says those spellings (where medial ζ becomes σδ in Lesbian poetry) almost certainly represent a later editing based on the then general value of ζ, as they are not found in early Lesbian inscriptions. They do point to the preservation of [zd] in Lesbian after ζ had changed to [z(z)] elsewhere, and the use of ζ for the result of synizesis in e.g. ζά = διά to the coexistence of some other sound (? [dz] or [z]) for which at the editorial date ζ was the most appropriate writing. No precise date is given. – Cairnarvon Jul 9 at 17:16
  • Oh, not at all for that reason; I don't have a copy of Vox Graeca, unfortunately (and the library is closed for the foreseeable future), and this question was inspired by seeing phrontisdēn in Sappho and thinking "huh, that seems like evidence for /dz/". That's interesting information though! So Aeolic likely had both /zd/ and something else in the time of Sappho and Alcaeus? – Draconis Jul 9 at 18:01
  • Maybe not at the time of Sappho and Alcaeus, but likely at the time of editing (presumably after the 4th century). Allen specifically says Lesbian poetry, so I don't know about the implications for Aeolic in general, and I'd also think it conceivable for recited poetry to preserve archaisms no longer present in the current language. – Cairnarvon Jul 10 at 8:10
  • True; I've heard that the digamma preserved in Lesbian poetry probably wasn't used in spoken Aeolic, so this could be something similar. – Draconis Jul 10 at 16:36

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