What does "cashew" mean?

Cashew: A tree (Anacardium occidentale) of the same family which the sumac. It is native in tropical America, but is now naturalized in all tropical countries. Its fruit, a kidney-shaped nut, grows at the extremity of an edible, pear-shaped hypocarp, about three inches long. Casbew nut, the large, kidney-shaped fruit of the cashew, which is edible after the caustic oil has been expelled from the shell by roasting the nut.