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.

Source: Webster's Revised Unabridged Dictionary (1913)