Where does “riuúma” come from?

riuúma (Northern Tepehuan) comes from Spanish reuma, from Late Latin rheuma, from Ancient Greek ῥεῦμα, from Ancient Greek ῥέω, from Proto-Indo-European srew-, from Proto-Indo-European ser- — to flow; to guard; to bind, to tie together.

riuúma (Northern Tepehuan): rheumatism

Definitions

rheumatism

Ancestry of “riuúma”, step by step

Step	Language	Word	Meaning
1	Spanish	reuma	rheumatism
2	Late Latin	rheuma	catarrh, rheum; flow
3	Ancient Greek	ῥεῦμα	stream, flow, current
4	Ancient Greek	ῥέω	I flow, stream, run, gush; I let flow, pour; I...
5	Proto-Indo-European	srew-	to flow, stream
6	Proto-Indo-European	ser-	to flow; to guard; to bind, to tie together

Every word from Proto-Indo-European ser- →Every word from Proto-Indo-European srew- →Every word from Ancient Greek ῥέω →