A slot car (sometimes, slotcar) is a powered miniature auto or other vehicle that is guided by a groove or slot in the track on which it runs.
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Full Definition of MULLION. : a slender vertical member that forms a division between units of a window, door, or screen or is used decoratively. â mullion transitive verb.See mullion defined for English-language learners.See mullion defined for kids. ADVERTISEMENT. an upright piece of wood, stone, metal, etc., that separates two windows.