I am looking for a good online dictionary.

Anyone got any suggestions please?

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Please feel free to correct anything I say in Irish that is incorrect.
Anything in English, leave it alone, I dont care.

Pota Focal is perhaps more for intermediate level:

http://www.potafocal.com/Home.aspx

But there are links at the bottom of the page to other dictionaries:

focal.ie at the bottom of the page is a technical dictionary for advanced scientific and other topics.

logainm.ie is a place name archive.

Then there are three links to more basic Irish-English dictionaries.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

go raibh maith agat Breandán

_________________
Please feel free to correct anything I say in Irish that is incorrect.
Anything in English, leave it alone, I dont care.