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strong lightweight wood of the balsa tree used especially for floats

balsa [ˈbɔːlsə] [ˈbɔːlsə] (also ˈbalsa wood) noun uncountable

the light wood of the tropical American balsa tree, used especially for making models

[balsa] early 17th cent. (denoting a kind of South American raft or fishing boat): from Spanish, raft.