A tropical American tree (Calycophyllum spruceanum) valued for its hard, durable wood used in construction and tool-making.
From Tupi or other Amazonian indigenous languages. The word entered English through naturalists documenting South American flora during colonial and post-colonial exploration.
Ausu wood is so dense and hard that indigenous peoples used it for centuries before European traders discovered its value—it's stronger than many metals for specific applications.
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