Focaloir Gaoidhilge-Sax-Bhearla or An Irish-English dictionary Whereof the Irish part hath been compiled not only from various Irish vocabularies, particularly that of Mr. Edward Lhuyd ; but also from a great variety of the best Irish manuscripts now extant ; especially those that have been composed from the 9th & 10th centuries, down to the 16th: besides those of the lives of St. Patrick & St. Brigit, written in the 6th & 7th centuries : John O'Brien : Free Download, Borrow, and Streaming : Internet Archive