A word appearing as ᴱQ. qolūva “pestilent, pestilential” in the Qenya Lexicon of the 1910s, an adjectival form of ᴱQ. qolu “disease” (QL/78).

Neo-Quenya: I’d retain ᴺQ. quolúva for purposes of Neo-Quenya in reference to things and environments apt to cause disease. Not all Neo-Quenya writers accept quo- as a valid combination; see the entry on how [wo] became [o] for further discussion.