A noun appearing as ᴱQ. qolu “disease” in the Qenya Lexicon of the 1910s derived from the early root ᴱ√QOLO (QL/78). This word was also mentioned in the contemporaneous Poetic and Mythological Words of Eldarissa (PME/78).

Neo-Quenya: I’d retain ᴺQ. quolu “disease” for purposes of Neo-Quenya, and would assume it applies to disease in general, as opposed to disease or sickness within a body which would be [ᴺQ.] hlívë. Not all Neo-Quenya writers accept quo- as a valid combination; see the entry on how [wo] became [o] for further discussion.