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From The Collaborative International Dictionary of English v.0.48:
Casuarina \Cas`u*a*ri"na\, n. [NL., supposed to be named from the resemblance of the twigs to the feathers of the cassowary, of the genus Casuarius.] (Bot.) A genus of leafless trees or shrubs, with drooping branchlets of a rushlike appearance, mostly natives of Australia. Some of them are large, producing hard and heavy timber of excellent quality, called beefwood from its color. [1913 Webster]