A dahlia is a garden flower with a lot of brightly coloured petals.
dahlia in British English
(ˈdeɪljə)
noun
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
Word origin
C19: named after Anders Dahl, 18th-century Swedish botanist; see -ia
dahlia in American English
(ˈdæljə; ˈdɑljə; Chiefly British ˈdeɪljə)
noun
1.
any of a genus (Dahlia) of perennial plants of the composite family, with tuberous roots and large, showyflower heads in various bright colors, native to Mexico and Central America