Where does “tree cassagh” come from?

tree cassagh (Manx) comes from Manx cass, from Old Irish cos, from Proto-Celtic koxsā, from Proto-Indo-European koḱs- — joint.

tree cassagh (Manx): three-legged

Definitions

  1. three-legged

Ancestry of “tree cassagh”, step by step

tree cassagh traces back through two separate lines of ancestry.

via Manx cass

StepLanguageWordMeaning
1Manxcassfoot, leg
2Old Irishcosfoot; leg
3Proto-Celtickoxsāleg, foot
4Proto-Indo-Europeankoḱs-joint

via Manx tree

StepLanguageWordMeaning
1Manxtreethree
2Old Irishtríthree
3Proto-Celtictrīsthree
4Proto-Indo-European*tréyes—
Every word from Proto-Indo-European koḱs- →Every word from Proto-Celtic koxsā →Every word from Old Irish cos →