a grinding mill in which the material to be ground is tumbled in a drum with heavy balls of iron, steel, or stone.
In another type of mill, called the ball mill, the principle is different.
Marvels of Scientific Invention Thomas W. Corbin
(engineering) a horizontal cylinder or cone in which a substance, such as a mineral, is ground by rotation with steel or ceramic balls
- Ball of fire
a dynamic person capable of or displaying rapid and highly effective thought, action, etc.: The new manager turned out to be a ball of fire. noun (informal) a very lively person noun phrase A dazzling performer; spectacularly successful striver; overachiever; go-getter, hot shot [1900+; perhaps fr earlier ball of fire, ”a very fast train”] A […]
- Ball of foot
ball of foot ball of foot n. The padded portion of the sole of the human foot between the toes and the arch, on which the weight of the body rests when the heel is raised.
- Ball of wax
everything, including all details, parts, etc., relating to a particular matter: He came back from Chicago with the contract for the whole ball of wax. Related Terms the whole ball of wax
a tract of land where ball games, especially baseball, are played. a baseball stadium. Informal. being an approximation, based on an educated guess: Give me a ballpark figure on our total expenses for next year. in the ballpark, Informal. within reasonable, acceptable, or expected limits: The price may go up another $10, but that’s still […]