mol

The root mol braids together two Latin threads that, though they look like one, started as siblings sharing a single image: matter you can grind or pile.

Thread one: molere — "to grind." In a Roman household the most familiar machine was the hand mill, where a heavy mola (millstone) crushed grain into flour. From this everyday act came a family of words about grinding and milling.

- The back teeth that crush your food are literally the body's millstones: a molar is a grinding tooth. Look at one and you see a flat, broad surface built to mash, not to bite.
- Before grain became flour, a miller took his cut. emolument comes from e- (out) + molere (grind): the grindings, the meal a miller "ground out" as his fee. Over centuries the literal flour faded and only the idea of payment-for-service survived — today an emolument is a salary or the perks of holding office.
- The Romans didn't just eat ground grain; they offered it to the gods. mola salsa was salted sacrificial meal sprinkled on a victim before it was killed. To immolate (im- on + mola sacrificial meal) first meant "to sprinkle the sacred grain on," then "to offer in sacrifice," and finally the violent modern sense: to kill or destroy as a sacrifice, especially by burning.

Thread two: mōlēs — "a huge mass, a great bulk." A mōlēs was anything massive: a boulder, a breakwater, a towering pile. This gives two very modern words.

- A molecule is, by its Latin spelling, a little mass: mōlēs shrunk by a diminutive ending. When early scientists needed a name for the smallest possible lump of a substance, they coined "a tiny mass."
- To demolish is to undo a great structure. From de- (down) + mōliri (to build up a massive thing, from mōlēs): if mōliri is to heap into a mighty bulk, demoliri is to pull that bulk back down. demolition is the act of doing so.

Why lump grinding and mass together? Because both are about material treated in bulk — grain crushed into meal, stone heaped into a wall. The mind that ground grain and the mind that piled boulders used the same root sound for "dealing with a great quantity of stuff." Hold onto the millstone image: it grinds (molar, emolument, immolate) and it is itself a heavy mass (molecule, demolish).