n. Any plant, of the genus Helianthus, having large flower heads with dark disk florets and showy yellow rays; the sunflowers
the GNU version of the Collaborative International Dictionary of English
n. any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays.
The Century Dictionary and Cyclopedia
n. A genus of plants, including the common sunflower, belonging to the natural order Compositæ, tribe Helianthoideæ, of which it is the type.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays
Word Usage
"She did not know that a helianthus was a sunflower till her mother told her, and she had never seen the dear, blue, bell-shaped flowers that always grow in old-fashioned gardens, and are called Canterbury bells."