Old Irish tánaise

← Proto-Celtic *sedeti (derived)

← Proto-Indo-European *sed- (derived)

← Old Irish to- (affix)

← Old Irish ad- (affix)

← Old Irish ne- (affix)

← Old Irish saidid (mention)

← Old Irish imm- (mention)

← Old Irish imthánad (mention)

→ Irish tánaiste (inherited)