True it is. I don't know what I was thinking

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__̴ı̴̴̡̡̡ ̡͌l̡̡̡ ̡͌l̡*̡̡ ̴̡ı̴̴̡ ̡̡͡|̲̲̲͡͡͡ ̲▫̲͡ ̲̲̲͡͡π̲̲͡͡ ̲̲͡▫̲̲͡͡ ̲|̡̡̡ ̡ ̴̡ı̴̡̡ ̡͌l̡̡̡̡.___

MacBain's dictionary of Scottish Gaelic reckons so. (ScG uses doire and Bain compares this to Irish doire,daire, and thence to oak.)

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.

Apologies, the pronunciation is:
/dar'e/ (Note: not /dαr'e/)

I'm using the standardised way of writing Old Irish (a description can be found in David Stifter's Sengoídelc, Lesson 3) where ai is always /a/ followed by a palatalized consonant.

Note that Old Irish possessed 11 diphthongs, 9 of which are not found in Modern Irish, as well as hiatuses vowels, so this spelling system is quite different. For example:
Daur = /da.ur/, au is not a diphthong or one vowel, both vowels are pronounced in seperate syllables.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

how many of the Dipthongs are retained in Scotland?

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Bíonn rudaí maithe mall

Daithí, your question only came back to me there now!

Not many, most of the Scottish Gaelic Diphthongs arose in the Middle Ages and are not related to the ones in Old Irish. (The same is true for Irish)

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

so had they been lost between old Irish and Medieval Irish/Scots Gaelic ?
And what caused other ones to reappear in Scots Gaelic ?

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Bíonn rudaí maithe mall

Same as in Irish (most Irish diphthongs are not from Old Irish either), they came into existence as consonants stopped being pronounced. Like -adh- in gadhar, which is now /gair/, that is: g, a diphthong, r. However it used to be /gaðar/ with ð the th sound in English this.

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

so old Irish had 11 diphthongs and then new ones came about later?

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Bíonn rudaí maithe mall

Off the top of my head, the main diphthongs in ScG are y-glides for slender DH/GH; and w-glides on broad Bh/Mh (depending on word and dialect) and in monyllabic words ending -ann/-all.

_________________
A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.