Entomology definition of Post-clypeus: in Odonata, the upper of the two parts
into which the clypeus is divided: in Psocidae, a peculiar
inflated structure behind the clypeus: in general, the posterior
or upper part of clypeus when any line of demarcation exists: =
supra-clypeus; nasus: afternose; paraclypeus: first clypeus;
clypeus posterior.