Definition of balsa noun from the Oxford Advanced Learner's Dictionary

 

balsa

 noun
noun
BrE BrE//ˈbɔːlsə//
 
; NAmE NAmE//ˈbɔːlsə//
 
(also balsa wood)[uncountable]
 
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the light wood of the tropical American balsa tree, used especially for making models Word Origin early 17th cent. (denoting a kind of South American raft or fishing boat): from Spanish, ‘raft’.
See the Oxford Advanced American Dictionary entry: balsa