Sentence:  his quill drawings had a scratchiness , suggesting skin texture ; the clay he used plastically to suggest soft moving flesh , as in an abdomen , in a reclining torso ; the <WSD>wax</WSD> he smoothed over to give the body surface an elastic pull . 
Meaning of the word marked with <WSD> tags:  any of various substances of either mineral origin or plant or animal origin; they are solid at normal temperatures and insoluble in water