noun. 1  a. An old French dance resembling the gavotte, usually in 3/4 or 2/2 time beginning with an upbeat. 2  A movement in ballet in which the dancer transfers body weight quickly from foot to foot, usually on the balls of the feet, in a series of small steps.
Nystagmus is a condition where the eyes make repetitive movements. The eyes can jerk exclusively in one direction, or make back and forth movements. With nystagmus, the eye can look jittery and can affect both eyes or just one eye.
Complete heterochromia is a fairly rare condition (in humans) whereby each iris is a distinctly different color, such as having one blue iris and the other brown. But this isnât why Bowieâs eyes looked different. Instead, the unusual appearance of Bowieâs eyes were due to a condition called anisocoria. Anisocoria is a condition characterized by an unequal size in a personâs pupils. In Bowieâs case, his left pupil was permanently dilated.