/ ˈlɒkɪt; NAmE ˈlɑːk-/ noun
a piece of jewellery in the form of a small case that you wear on a chain around your neck and in which you can put a picture, piece of hair, etc.
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WORD ORIGIN
late Middle English (originally referring to a metal plate or band on a sword cover): from Old French locquet , diminutive of loc latch, lock, of Germanic origin; related to the verb lock . The current sense dates from the late 17th cent.