Source : Webster's Revised Unabridged Dictionary (1913)

Papaveraceous \Pa*pav`er*a"ceous\, a. (Bot.)
   Of, pertaining to, or resembling, a natural order of plants
   ({Papaverace[ae]}) of which the poppy, the celandine, and the
   bloodroot are well-known examples.

Source : WordNet®

Papaveraceae
     n : herbs or shrubs having milky and often colored juices and
         capsular fruits [syn: {family Papaveraceae}, {poppy
         family}]