Where does “rumoritis” come from?

rumoritis (English) comes from English rumor, from Middle English rumour, from Old French rumeur, from Latin rumor, from Proto-Italic roumōs, from Proto-Indo-European *h₃rewH- — to roar, to howl, to shout.

rumoritis (English): A tendency to spread rumors

Definitions

A tendency to spread rumors

Ancestry of “rumoritis”, step by step

rumoritis traces back through two separate lines of ancestry.

via English rumor

Step	Language	Word	Meaning
1	English	rumor	A statement or claim of questionable accuracy,...
2	Middle English	rumour	—
3	Old French	rumeur	—
4	Latin	rumor	rumor; rustle, murmur, a murmuring; The voice of...
5	Proto-Italic	roumōs	—
6	Proto-Indo-European	*h₃rewH-	to roar, to howl, to shout

via English itis

Step	Language	Word	Meaning
1	English	itis	A medical condition accompanied by inflammation;...
2	English	-itis	Suffix denoting diseases characterized by...
3	New Latin	-ītis	—
4	Ancient Greek	-ῖτις	female equivalent of -ίτης

Every word from Proto-Indo-European *h₃rewH- →Every word from Proto-Italic roumōs →Every word from Latin rumor →