Where does “yleisö-WC” come from?

yleisö-WC (Finnish) comes from Finnish yleisö, from Finnish ylä-, from Finnish alhaalla, from Finnish ala-, from Proto-Finnic ala, from Proto-Uralic ëla — below.

yleisö-WC (Finnish): public toilet, public restroom

Definitions

public toilet, public restroom

Ancestry of “yleisö-WC”, step by step

yleisö-WC traces back through two separate lines of ancestry.

via Finnish yleisö

Step	Language	Word	Meaning
1	Finnish	yleisö	audience; public
2	Finnish	ylä-	upper; superior, high, higher
3	Finnish	alhaalla	down below, below; down (here/there)
4	Finnish	ala-	under-, sub-, lower, nether; inferior
5	Proto-Finnic	ala	lower; under
6	Proto-Uralic	ëla	below

via Finnish wc

Step	Language	Word	Meaning
1	Finnish	wc	WC water closet
2	English	WC	Initialism of water closet: a lavatory; a toilet;...

Every word from Proto-Uralic ëla →Every word from Finnish ala- →Every word from Proto-Finnic ala →