well, FWIW, it is in OED online:

Etymology: < ancient Greek ϕλύαρος [phlyaros?] silly talk, nonsense (probably < ϕλύειν to boil over, to babble
Obs. nonce-wd. [i.e., it was coined for the instance and never used again, until the 'net discovered it - 2650 gh]

A person who talks nonsense.
1867 Athenum 12 Oct. 459/1, I would not meddle with such a phlyarologist.