The Collaborative International Dictionary of English v.0.48:

Fritillaria \Frit"il*la`ri*a\, n. [NL., fr. L. fritillus
   dicebox: cf. F. fritillaire. So named from the checkered
   markings of the petals.] (Bot.)
   A genus of liliaceous plants, of which the crown-imperial
   (Fritillaria imperialis) is one species, and the Guinea-hen
   flower (F. Meleagris) another. See Crown-imperial.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Crown-imperial \Crown"-im*pe"ri*al\ (-?m-p?"r?-al), n. (Bot.)
   A spring-blooming plant (Fritillaria imperialis) of the
   Lily family, having at the top of the stalk a cluster of
   pendent bell-shaped flowers surmounted with a tuft of green
   leaves.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Fritillaria imperialis
    n 1: Eurasian herb with a cluster of leaves and orange-red bell-
         shaped flowers at the top of the stem [syn: crown
         imperial, Fritillaria imperialis]