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A large tree of species Acacia koa (family Fabaceae) which is endemic to and common on the islands of Hawaii; or the wood of this tree.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 59:
As you get higher, native vegetation takes over, so a prospect might be framed by the dangling leaves of the beautiful koa tree, each leaf a gently curved, trembling sickle.
2007 March 18, Anne Eisenberg, “How to Soften the Edges of Technology”, in New York Times: