Wall·flow·er n.
  1. Bot. A perennial, cruciferous plant (Cheiranthus Cheiri), with sweet-scented flowers varying in color from yellow to orange and deep red. In Europe it very common on old walls.
  Note: ☞ The name is sometimes extended to other species of Cheiranthus and of the related genus Erysimum, especially the American Western wallflower (Erysimum asperum), a biennial herb with orange-yellow flowers.
  2. A lady at a ball, who, either from choice, or because not asked to dance, remains a spectator.  [Colloq.]
  3. Bot. In Australia, the desert poison bush (Gastrolobium grandiflorum); -- called also native wallflower.
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  Gil·ly·flow·er n.  [Written also gilliflower.] Bot.
  1. A name given by old writers to the clove pink (Dianthus Caryophyllus) but now to the common stock (Matthiola incana), a cruciferous plant with showy and fragrant blossoms, usually purplish, but often pink or white.
  2. A kind of apple, of a roundish conical shape, purplish red color, and having a large core.
  Clove gillyflower, the clove pink.
  Marsh gillyflower, the ragged robin (Lychnis Flos-cuculi).
  Queen's gillyflower, or Winter gillyflower, damewort.
  Sea gillyflower, the thrift (Armeria vulgaris).
  Wall gillyflower, the wallflower (Cheiranthus Cheiri).
  Water gillyflower, the water violet.
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  Cheiranthus cheiri
       n : perennial of southern Europe having clusters of fragrant
           flowers of all colors especially yellow and orange; often
           naturalized on old walls or cliffs; sometimes placed in
           genus Erysimum [syn: wallflower, Erysimum cheiri]