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From The Collaborative International Dictionary of English v.0.48:
Palmaceae \Palmaceae\ n. A natural family of chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales. Syn: Palmae, family Palmae, family Palmaceae, Arecaceae, family Arecaceae, palm family. [WordNet 1.5]