Ilk. later [ei], [ou] became [ē], [au]; [ei|ou] > [ē|au]

Ilk. later [ei], [ou] became [ē], [au]; [ei|ou] > [ē|au]

Where the diphthongs [ei] and [ou] developed at a later stage in Ilkorin, from the vocalization of [z] or of [g], these diphthongs developed into [ē] and [ou], as opposed to primitive ᴹ✶[ei] and ᴹ✶[ou] which became [ī] and [ū] respectively (PE19/25). The development is well-attested for [ou] > [au]: ᴹ✶kuʒnā > kogna > coun > Ilk. caun (Ety/KUƷ). This rule is more speculative in the case of [ei] > [ē], but can be deduced from examples like ᴹ✶ezdē > Ilk. Êd (EtyAC/EZDĒ). Helge Fauskanger suggested instead that this might simply be due to the lengthening of the original [e] rather than the development of a diphthong [ei] (AL-Doriathrin/méd).

Order (05200)

After 04200 [g] vocalized before [m], [n] ᴹ✶kuʒnā > kogna > coun > Ilk. caun Ety/KUƷ
After 04300 voiced stops spirantalized after vowels ᴹ✶kuʒnā > kogna > coun > Ilk. caun Ety/KUƷ
After 04500 [z] became [i] before voiced stops ᴹ✶mizdā > Dor. mēd Ety/MIZD

Phonetic Rule Elements

[ei] > [ē]
[ou] > [au]

Phonetic Rule Examples

eid > ēd ei > ē ᴹ✶EZDĒ > Ilk. Ēd ✧ EtyAC/EZDĒ
meid > mēd ei > ē ᴹ✶mizdā > Dor. mēd ✧ Ety/MIZD
doum > daum ou > au ᴹ√DOƷ/DÔ > Ilk. daum ✧ Ety/DOƷ
koun > kaun ou > au ᴹ✶kuʒnā > kogna > coun > Ilk. caun ✧ Ety/KUƷ
soum > saum ou > au ᴹ✶sukmā > Ilk. saum ✧ Ety/SUK