Where does “laezh-glas” come from?

laezh-glas (Breton) comes from Breton glas, from Middle Breton glas, from Proto-Brythonic glas, from Proto-Celtic glastos, from Proto-Indo-European ǵʰl̥h₃stós, from Proto-Indo-European ǵʰelh₃- — to flourish; green, yellow.

laezh-glas (Breton): whey

Definitions

whey

Ancestry of “laezh-glas”, step by step

laezh-glas traces back through two separate lines of ancestry.

via Breton glas

Step	Language	Word	Meaning
1	Breton	glas	blue
2	Middle Breton	glas	—
3	Proto-Brythonic	glas	green, blue
4	Proto-Celtic	glastos	green, blue
5	Proto-Indo-European	ǵʰl̥h₃stós	—
6	Proto-Indo-European	ǵʰelh₃-	to flourish; green, yellow

via Breton laezh

Step	Language	Word	Meaning
1	Breton	laezh	milk
2	Proto-Brythonic	llaɨθ	milk
3	Latin	lactis	genitive singular of lac; of milk; milk
4	Latin	lác	milk
5	Proto-Indo-European	ǵlákts	milk

Every word from Proto-Indo-European ǵʰelh₃- →Every word from Proto-Indo-European ǵʰl̥h₃stós →Every word from Proto-Celtic glastos →