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balsa

bal·sa [ báwlssə, blssə ] (plural bal·sas or bal·sa)


noun 
Definition:
 
1. lightweight wood: a lightweight softwood. Use: rafts, toy models, insulation.

2. tree with lightweight wood: a tree that yields balsa. Native to: South America.  Genus Ochroma.

[Early 17th century. < Spanish, "raft"]
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