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plural koas or koa
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. quotations examples
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.
2004, Richard Fortey, The Earth, Folio Society, published 2011, page 59
The outer frame is made of koa and maple.
2007 March 18, Anne Eisenberg, “How to Soften the Edges of Technology”, in New York Times
At her funeral, Likelike's body was placed in a polished koa coffin, adorned with sprays of gardenia […].
2012, Julia Flynn Siler, Lost Kingdom, Grove Press, page 122