Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Manx arree
Proto-Celtic *regeti (inherited)
Irish athraigh (cognate)
Scottish Gaelic atharraich (cognate)
Manx irree (cognate)
Proto-Indo-European *h₃reǵ- (root)
Proto-Indo-European *h₃reǵ- (inherited)
Middle Irish aithrigid (inherited)
Old Irish ad·eirrig (inherited)
Old Irish ath- (mention)
Old Irish ar- (mention)
Old Irish at·reig (cognate)

Irish athraigh (cognate)