Where does “sinserbráthair” come from?

sinserbráthair (Old Irish) comes from Old Irish bráthair, from Proto-Celtic brātīr, from Proto-Indo-European bʰréh₂tēr — brother.

sinserbráthair (Old Irish): elder brother, senior kinsman

Definitions

  1. elder brother, senior kinsman

Ancestry of “sinserbráthair”, step by step

sinserbráthair traces back through two separate lines of ancestry.

via Old Irish bráthair

StepLanguageWordMeaning
1Old Irishbráthairbrother, cousin, kinsman
2Proto-Celticbrātīrbrother
3Proto-Indo-Europeanbʰréh₂tērbrother

via Old Irish sinser

StepLanguageWordMeaning
1Old Irishsinserthe elder, eldest; senior; elders, ancestors,...
2Proto-Indo-European*[[sénos—
Every word from Proto-Indo-European bʰréh₂tēr →Every word from Proto-Celtic brātīr →Every word from Old Irish bráthair →