Etymology
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wallflower (n.)

1570s, type of flowering plant cultivated in gardens, native to southern Europe, where it grows on old walls and in rocky places, from wall (n.) + flower (n.). Colloquial sense of "woman who sits by the wall at parties, often for want of a partner" is first recorded 1820.

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Definitions of wallflower

wallflower (n.)
any of numerous plants of the genus Erysimum having fragrant yellow or orange or brownish flowers;
wallflower (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;
Synonyms: Cheiranthus cheiri / Erysimum cheiri
wallflower (n.)
remains on sidelines at social event;
From wordnet.princeton.edu