Old Irish tír

← Proto-Celtic *tīros (inherited)

← English thirst (cognate)

← Proto-Indo-European *ters- (root)

← Proto-Indo-European *ters- (derived)

← Latin terra (cognate)

→ English Ulster (mention)

→ Irish tír (inherited)

→ Irish fothair (mention)

→ Irish tíor (mention)

→ Scottish Gaelic tìr (inherited)

→ Manx çheer (inherited)

→ Latin terra (cognate)

→ Old Irish foithir (mention)