['wɔ:lflauә(r)]
n.
[植]桂足香,桂香香水, 局外人

Wallflower \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}.
[Webster 1913 Suppl.]