S. diphthongs

original primitive diphthongs developed as follows:

CE OS S   CE OS S
ei > ē ī ī   iu iu ȳ
ai, ę̄ ai > ae ae   eu iu ȳ
oi ui ui   au, ǭ au au
ui ui ui   ou > ō ū ū

later diphthongs developed as follows:

OS S   OS S
ei ai   iu ȳ
ai ai   eu ȳ?
œi ei   au au
ui? ui   ou au

References ✧ LotR/1116.1403; LotR/1116.1801-1; RGEO/63.2901; RGEO/63.5401

Elements

[ae] ✧ LotR/1116.2309 (ae); RGEO/63.2903 (ae)
[ai] ✧ LotR/1116.1912-1 (ai)
[ei] ✧ LotR/1116.1913 (ei)
[oe] ✧ LotR/1116.2310 (oe); RGEO/63.2904 (oe)
[ui] ✧ LotR/1116.2002-1 (ui); RGEO/63.2906 (ui)
[au] “aw” ✧ LotR/1116.2108-1 (au); RGEO/63.2905 (au)

N. diphthongs

Reference ✧ PE22/034.1501

Elements

[ae]
[ai]
[ei]
[oe]
[ui]
[au]

ᴱN. diphthongs

Elements

[ai]
[au]
[ei]
[io]
[ui]

G. diphthongs

Elements

[ai]
[au]
[ei]
[io]
[ui]