monopneumonia

from The Collaborative International Dictionary of English v.0.48

Monopneumona \Mon`op*neu"mo*na\, n. pl. [NL. See {Mono-}, and
   {Pneumonia}.] (Zool.)
   A suborder of Dipnoi, including the Ceratodus. [Written also
   {monopneumonia}.]
   [1913 Webster]