Having just seen one outside my house I was curious to know what the word for Otter is.

I can find dobharchú, dobhrán, gaidhrín sáile agus madra uisce.

Can anyone tell me which is the most commonly used in Munster?

Wikipedia tells me that a dobharchú is a mythological otter like beast. But then Wikipedia isint a flawless source.

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Bíonn rudaí maithe mall

Madar uisce (well, that is what it sounds like after you run madra and uisce together).

mada uisce - is what we say in Conamara too.

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It is recommended that you always wait for three to agree on a translation.
I speak Connemara Irish, and my input will often reflect that.
I will do an mp3 file on request for short translations.
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Definitely Madra Uisce, sometimes pronounced Madar Uisce as patrick said, and also Mada Uisce as Bríd said.

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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 it's "Madara Uisce" in Munster, right?

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Yeah, Madara Uisce, but the last a in Madara is often elided and also people typically don't include the helping/epenthetic vowel in the spelling (Madra).

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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

as are all final -a and -e when followed by a word that starts with a vowel... so we can write "madara uisce" just as we write duine uasal and not duin uasal etc

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Is fearr Gaeilg na Gaeltaċta ná Gaeilg ar biṫ eile
Agus is í Gaeilg Ġaoṫ Doḃair is binne

Lúghaidh, the question for me is the plural.

I have seen this word written madaruisce (one word). I've found it another source as madra-uisge, with a hyphen.

So what is the plural? I don't have attestation of that - would it be as if two words? Madraí uisce? Or would it be as one word? Madaruiscí? Madra-uiscí? Madaruisceacha?

I'm thinking of machtíre for "wolf" (not mac tíre, by the way) - where the plural is machtírí (not *mic tíre).

Clearly the question of what the plural is could only be solved by attestation of the form.

I see Maidhc Dainín had madraí uisce in the plural: http://www.coisceim.ie/madraiuisce.html

You have found Maidhc Dainín's book, but just to say that is definitely the plural in Corca Dhuibhne, it's the only one I've heard used.
What is it in Conamara?

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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