Parapleur[ae]

from The Collaborative International Dictionary of English v.0.48

Parapleura \Par`a*pleu"ra\, n.; pl. {Parapleur[ae]}. [NL. See
   {Para-}, and 2d {Pleura}.] (Zool.)
   A chitinous piece between the metasternum and the pleuron of
   certain insects.
   [1913 Webster]