Sawdust
Sawdust was a fine substance created by the sawing of wood. 

While detained by the Tandarans in 2152, Travis Mayweather told his captor Klev that he didn't think he could hold down another bowl of what he was being fed because it tasted "like sawdust." ()

While showing Captain Kathryn Janeway around the newly constructed  in 2371, Admiral Patterson told her that there was "still some work to be done, but once the sawdust clears I think you'll be impressed." ()

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