Where does “lárchóras” come from?

lárchóras (Irish) comes from Irish lár, from Old Irish lár, from Proto-Celtic ɸlārom, from Proto-Indo-European pleh₂ros, from Proto-Indo-European pleh₂- — flat.

lárchóras (Irish): central system

Definitions

central system

Ancestry of “lárchóras”, step by step

lárchóras traces back through two separate lines of ancestry.

via Irish lár

Step	Language	Word	Meaning
1	Irish	lár	ground, floor; middle, center
2	Old Irish	lár	surface, ground, floor; middle, interior
3	Proto-Celtic	ɸlārom	floor
4	Proto-Indo-European	pleh₂ros	flat; floor
5	Proto-Indo-European	pleh₂-	flat

via Irish córas

Step	Language	Word	Meaning
1	Irish	córas	system
2	Old Irish	córus	—

Every word from Proto-Indo-European pleh₂- →Every word from Proto-Indo-European pleh₂ros →Every word from Proto-Celtic ɸlārom →