The Collaborative International Dictionary of English v.0.48:

Compositae \Com*pos"i*t[ae]\, n. pl. [NL., from L. compositus
   made up of parts. See Composite.] (Bot.)
   A large family of dicotyledonous plants, having their flowers
   arranged in dense heads of many small florets and their
   anthers united in a tube. The daisy, dandelion, and asters,
   are examples.
   [1913 Webster]