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| Manual Winding | The watch must be wound by turning the crown back and forth until resistance is met—usually every 24 hours. |
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| Mechanical Movement | A watch's mechanism that is powered by a manual activity such as being wound up by hand or by the movement of the watch. |
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| Mineral Crystal | Watch crystal made from what is essentially a form of glass. More scratch resistant than acrylic, a mineral crystal can scratch and is extremely difficult to polish. |
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| Moon Phase | An indicator that keeps track of the phases of the moon. |
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| Mother of Pearl | Iridescent, milky interior shell of the fresh water mollusk that is sliced thin and used on watch dials. While most have a milky white luster, mother-of-pearl also comes in other colors such as silvery gray, gray blue, pink, and salmon. |
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| Movement | The inner workings or assembly that makes up the main timekeeping mechanism. Movements are either quartz or mechanical. This is the engine of the watch. |
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