balsa

n. light strong wood (used to build models, rafts, etc.); raft

Balsa (Ochroma pyramidale, synonym O. lagopus) is a large, fast-growing tree that can grow up to 30 m tall, native to  tropical South America north to southern Mexico. It is evergreen, or dry-season deciduous if the dry season is long, with large (30–50 cm) weakly palmately lobed leaves. The name balsa derives from Spanish for a raft.
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Noun
1. strong lightweight wood of the balsa tree used especially for floats
(synonym) balsa wood
(hypernym) wood
(substance-holonym) Ochroma lagopus
2. forest tree of lowland Central America having a strong very light wood; used for making floats and rafts and in crafts
(synonym) Ochroma lagopus
(hypernym) angiospermous tree, flowering tree
(member-holonym) Ochroma, genus Ochroma
(substance-meronym) balsa wood

n. balsa, light strong wood

n. balsa, light strong wood (used to build models, rafts, etc.); raft