Given that the cashew tree is not related to the mahoganies, interesting that this word came to be applied to the wood -- and it's not at all clear from the traces online how this happened. Nor is it clear which way the application went: the word is from French acajou, cashew, from which the English cashew also derives, from Portuguese, acaju, from Old Tupi acaju or agapú or acajuba or aka'iu -- the dictionaries have a range of romanizations, if those aren't actually different words, and disagree on what it/they meant, either cashew or mahogany. If anyone can provide clarity on the matter, I'd appreciate it.
Across the clearing were the spreading branches of a fine old acajou.
---L.