Millstone - Vine's Expository Dictionary of New Testament Words
Millstone[ A-1,Noun,G3458, mulos ]
denotes a handmill," consisting of two circular stones, one above the other, the lower being fixed. From the center of the lower a wooden pin passes through a hole in the upper, into which the grain is thrown, escaping as flour between the stones and falling on a prepared material below them. The handle is inserted into the upper stone near the circumference. Small stones could be turned by one woman (mill-grinding was a work deemed fit only for women and slaves; cp. Judges 16:21); larger ones were turned by two (cp. Matthew 24:41, under MILL), or more.
Still larger ones were turned by an ass (onikos), Matthew 18:6, RV, "a great millstone" (marg., "a millstone turned by an ass"), indicating the immediate and overwhelming drowning of one who causes one young believer to stumble; Mark 9:42 (where some mss. have lithos multikos, "a stone of a mill," as in Luke 17:2); Revelation 18:22 (some mss. have it in Revelation 18:21, See below).
[ B-1,Adjective,G3457, mulikos ]
"of a mill," occurs in Luke 17:2 (See above).
[ B-2,Adjective,G3458, mulinos ]
"made of millstone," is used with lithos, "a stone;" and with the adjective megas, "great," in the best mss. in Revelation 18:21 (some have the word mulos; See A).