Source : Webster's Revised Unabridged Dictionary (1913)

Fritillary \Frit"il*la*ry\, n.
   1. (Bot.) A plant with checkered petals, of the genus
      Fritillaria: the Guinea-hen flower. See {Fritillaria}.

   2. (Zo["o]l.) One of several species of butterflies belonging
      to {Argynnis} and allied genera; -- so called because the
      coloring of their wings resembles that of the common
      {Fritillaria}. See {Aphrodite}.

Source : WordNet®

fritillary
     n 1: any liliaceous plant of the genus Fritillaria having nodding
          variously colored flowers [syn: {checkered lily}]
     2: butterfly with brownish wings marked with black and silver