Vine's Expository Dictionary: View Entry
†μύλος mýlos, moo'-los; probably ultimately from the base of G3433 (through the idea of hardship); a "mill", i.e. (by implication), a grinder (millstone):—millstone.
The KJV translates Strong's G3458 in the following manner: millstone (with G3684) (2x), millstone (2x).
a mill stone
a large mill consisted of two stones, an upper and an under one
the "nether" stone was stationary, but the upper one was turned by an ass
a mill, the noise made by a mill
Strong's Number G3458 matches the Greek μύλος (mylos),
which occurs 4 times in 4 verses
in the TR Greek.