Noun
(Celtic linguistics) An Old Irish pronominal clitic added to the end of an accentual unit containing a pronoun, now more commonly called emphatic suffixes.
(Celtic linguistics) A Welsh reduplicated or conjunctive pronoun (appearing in modern Welsh as minnau, tithau, yntau, hithau, ninnau, chwithau, and hwythau).
Source: en.wiktionary.org