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The cashew seed is the edible nut derived from the cashew tree (Anacardium occidentale), native to tropical regions of Brazil but now widely grown in other parts of the world.The cashew seed is kidney-shaped, with a curved or "C" form.The size of the seed typically ranges from 2–3 cm in length and about 1–2 cm in width.The seed's outer shell is grayish-brown, and once the shell is removed, the edible nut inside is pale off-white to light brown.The cashew seed is encased in a hard, toxic shell, which must be carefully removed before the seed can be consumed. The shell contains an irritating substance called anacardic acid, which is toxic and requires proper handling during processing.