Flesh is the soft substance of the body of a living human or other animal. In a human or other animal body, this consists of muscle and fat; for vertebrates, this especially includes muscle tissue (skeletal muscle), as opposed to and Viscus. Animal flesh, as food, is called meat. In plants, "flesh" is the tissue of the plant, which is composed of cellulose (a biomolecule that serves as the plants' cytoskeleton).
In mycology, "flesh" refers to trama, the fleshy, inner portion of a mushroom's basidiocarp, or fruit body.