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Definition of CASUARINA
: any of a genus (Casuarina of the family Casuarinaceae) of dicotyledonous chiefly Australian trees which have whorls of scalelike leaves and jointed stems resembling horsetails and some of which yield a heavy hard wood
Any of the chiefly Australian trees that make up the genus Casuarina (family Casuarinaceae), which have whorls of scalelike leaves and segmented stems resembling horsetails. Several species, especially C. equisetifolia, are valued for their hard, dense, yellowish to reddish brown wood, which is strong and reputed to be resistant to termite attack. Beefwood and ironwood are common names that reflect the wood's colour and hardness.