[dal-yuh, dahl- or, esp. British, deyl-]
any composite plant of the genus Dahlia, native to Mexico and Central America and widely cultivated for its showy, variously colored flower heads.
the flower or tuberous root of a dahlia.
a pale violet or amethyst color.
of the color dahlia.

1791; < Neo-Latin, named after Anders Dahl (died 1789), Swedish botanist; see -ia

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World English Dictionary
dahlia (ˈdeɪljə)
1.  any herbaceous perennial plant of the Mexican genus Dahlia, having showy flowers and tuberous roots, esp any horticultural variety derived from D. pinnata: family Asteraceae (composites)
2.  the flower or root of any of these plants
[C19: named after Anders Dahl, 18th-century Swedish botanist; see -ia]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1804, named 1791 for Anders Dahl (1751-1789), Swedish botanist who discovered it in Mexico. No blue variety had ever been cultivated, hence "blue dahlia," fig. for "something impossible or unattainable" (1880).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No one would ever expect to get a first-rate heartsease or dahlia from the seed of a wild plant.
The edible root, which measures one and a half to two inches in length, resembles a dahlia tuber.
When your flowers are up and ready to cut, see our dahlia cutting tips.
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