(mechanical engineering) A rotary cutting tool typically used in milling machines.

(historical) A simple mill, often powered by animals, which grinds a material (grain, olives, chalk, etc) between a stationary horizontal stone disk and two vertical stone cylinders, in order to produce flour, olive oil, etc.

mill that manufactures black powder (type of gunpowder)

An airtight glass bulb containing a partial vacuum and a set of vanes, mounted on a spindle, which rotate when exposed to light, providing a quantitative measurement of electromagnetic radiation intensity.

Rumor mill.

A kind of mill for grinding and mixing clay, either for art or brickmaking. It consists essentially of an upright shaft armed with projecting knives, which is caused to revolve in a hollow cylinder, tub, or vat, in which the clay is placed.

plural of mill wheel

slag from a puddling furnace

Alternative form of millwheel

A windmill of which only the cap turns round to meet the wind. It is different from a post mill, whose whole building turns on a post.