From the Super Mario Wiki, the Mario encyclopedia
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A Nitro Course (also referred to as a Nitro Track) is the term used to refer to an original course in the Mario Kart series that is new to the series and has never appeared before. They have appeared in every Mario Kart title, although they were not officially named as such until Mario Kart DS. In Mario Kart: Super Circuit, the original tracks are called Super Circuit Tracks to distinguish them from the tracks originating from Super Mario Kart, called Extra Tracks. Some of them will or have reappeared in later Mario Kart games as Retro Courses. At least one Mario Circuit, Bowser's Castle, Rainbow Road, a beach- or water-themed course, and a snow-themed course have appeared in each Mario Kart game as a Nitro Course.
NOTE: From Mario Kart DS onwards, it is the last cup of the Retro Courses.
Names in other languages
Super Circuit Tracks