The term “cycloid” refers to a specific type of curve traced by a point on the circumference of a circular wheel as it rolls along a straight line. More broadly, it can describe the properties or characteristics related to this curve. In mathematics, the cycloid has various applications, particularly in the study of motion and dynamics. The curve is defined parametrically and has distinctive features, such as its cusps and oscillatory shape. In addition, “cycloid” can also refer to a category of fish with smooth, rounded scales.