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A very large family of flowering plants, the Compositae (or Asteraceae), characterized by having many small flowers arranged in a head that looks like a single flower, with one or more whorls of bracts underneath. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a large and varied plant family, Compositae, typified by nonwoody plants having flower heads composed of a disk containing tiny flowers, the flowers at the rim extending one petal outward to form a surrounding ray: includes the aster, daisy, dandelion, marigold, sunflower, thistle, and zinnia.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.