Sawdust
the accumulated particles caused by sawing wood, stone, etc. Besides the more common uses of sawdust, it is commercially valuable as the basis of various manufactures. Oxalic acid is manufactured on a large scale from wood sawdust. Sawdust is also used in the "carbonating" stage of the process for the manufacture of soda ash. The substance called bois-durci (hardened wood), of which beautiful ebony-like medallions and other ornaments are made, consists of the fine sawdust of rosewood, ebony, and other woods formed into a paste and considerable size, specimens with a saw six feet long and a foot broad at the base being far from rare. Their offensive weapon renders them dangerous to almost all other large inhabitants of the ocean.
The sawfish use their rostral weapon in tearing off pieces of flesh from their prey or in ripping open the abdomen, when they seize and devour the detached portions or the protruding soft parts.