Balsa definitions

bôl'sə
A raft consisting of a frame fastened to buoyant cylinders of wood or metal.
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A tropical American tree (Ochroma pyramidale) having soft wood that is very light in weight and is used as a substitute for cork in insulation, floats, and crafts such as model airplanes.
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The wood of this tree.
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Any of several tropical American trees (genus Ochroma) of the bombax family that yield an extremely light and buoyant wood used for rafts, model airplanes, etc.
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The wood.
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A raft, esp. one made up of a frame resting on cylindrical floats.
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A large tree, Ochroma lagopus, native to tropical America, with wood that is very light in weight.
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(uncountable) The wood of this tree.
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A raft or float, used principally on the Pacific coast of South America.
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Origin of balsa

From Spanish balsa, from a pre-Roman (Iberia) language, probably Basque or Iberian.