Definition of tower-mill:
(n) :
Any very tall building or structure; skyscraper.
(n) :
A very tall iron-framed structure, usually painted red and white, on which microwave, radio, satellite, or other communication antennas are installed; mast.
(n) :
A similarly framed structure with a platform or enclosed area on top, used as a lookout for spotting fires, plane crashes, fugitives, etc.
(n) :
A water tower.
(n) :
A control tower.
(n) :
(figuratively) An item of various kinds, such as a computer case, that is higher than it is wide.