balsa(n = noun.plant) ochroma lagopus - forest tree of lowland Central America having a strong very light wood; used for making floats and rafts and in crafts;
balsa, n.
1 (in full balsa-wood) a type of tough lightweight wood used for making models etc.
2 the tropical American tree, Ochroma lagopus, from which it comes.
Etymology
Sp., = raft
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