Where does “plas” come from?

plas (Welsh) comes from Old French place, from Latin platēa, from Ancient Greek πλατεῖα, from Ancient Greek πλατύς, from Proto-Indo-European pléth₂us, from Proto-Indo-European pleth₂- — flat.

plas (Welsh): mansion; palace; hall

Definitions

mansion; palace; hall

Ancestry of “plas”, step by step

Step	Language	Word	Meaning
1	Old French	place	place; location
2	Latin	platēa	broad way, street
3	Ancient Greek	πλατεῖα	feminine nominative singular of πλατύς; feminine...
4	Ancient Greek	πλατύς	wide, broad; flat, level; broad-shouldered
5	Proto-Indo-European	pléth₂us	flat, broad
6	Proto-Indo-European	pleth₂-	flat

Every word from Proto-Indo-European pleth₂- →Every word from Proto-Indo-European pléth₂us →Every word from Ancient Greek πλατύς →