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.

Pellitory \Pel"li*to*ry\, n. [Sp. pelitre, fr. L. pyrethrum. See
   {Bertram}.] (Bot.)
   (a) A composite plant ({Anacyclus Pyrethrum}) of the
       Mediterranean region, having finely divided leaves and
       whitish flowers. The root is the officinal pellitory, and
       is used as an irritant and sialogogue. Called also
       {bertram}, and {pellitory of Spain}.
   (b) The feverfew ({Chrysanthemum Parthenium}); -- so called
       because it resembles the above.

Source : WordNet®

pellitory
     n 1: herb that grows in crevices having long narrow leaves and
          small pink apetalous flowers [syn: {pellitory-of-the-wall},
           {wall pellitory}, {Parietaria difussa}]
     2: small Mediterranean plant containing a volatile oil once
        used to relieve toothache [syn: {pellitory-of-Spain}, {Anacyclus
        pyrethrum}]