痎

noun: tertian malaria (literary)
痎瘧

The page lists two senses under the identical Teochew reading gai1 ("tertian malaria" and "itchy"); the "itchy" sense is explicitly tagged as Cantonese/Hakka dialectal (not Teochew), so the general literary sense "tertian malaria" was chosen, but this is a rare classical character and the dialect scoping is not fully explicit for the first sense.