Source : Webster's Revised Unabridged Dictionary (1913)

Pellitory \Pel"li*to*ry\, n. [OE. paritorie, OF. paritoire, F.
   pari['e]taire; (cf. It. & Sp. parietaria), L. parietaria the
   parietary, or pellitory, the wall plant, fr. parietarus
   belonging to the walls, fr. paries, parietis a wall. Cf.
   {Parietary}.] (Bot.)
   The common name of the several species of the genus
   {Parietaria}, low, harmless weeds of the Nettle family; --
   also called {wall pellitory}, and {lichwort}.

   Note: {Parietaria officinalis} is common on old walls in
         Europe; {P. pennsylvanica} is found in the United
         States; and six or seven more species are found near
         the Mediterranean, or in the Orient.