From Longman Dictionary of Contemporary Englishbalsabal‧sa /ˈbɔːlsə $ ˈbɒːl-/ noun [countable, uncountable] HBPa tropical American tree or the wood from this tree, which is very light
Examples from the Corpus
balsa• The lighter woods, such as balsa, can be crushed with the finger.• Whole sections of the City were trampled flat, buildings going down like balsa wood.• The boy sat on the floor beside her, carving a piece of balsa wood.Origin balsa (1600-1700) Spanish 