Pirouette
[peer-WET]
Whirl or spin. A complete turn of the body on one foot, on point or demi-pointe. Pirouettes are performed en dedans, turning inward toward the supporting leg, or en dehors, turning outward in the direction of the raised leg. Correct body placement is essential in all kinds of pirouettes. The body must be well centered over the supporting leg with the back held strongly and the hips and shoulders aligned. The force of momentum is furnished by the arms, which remain immobile during the turn. The head is the last to move as the body turns away from the spectator and the first to arrive as the body comes around to the spectator, with the eyes focused at a definite point which must be at eye level. This use of the eyes while turning is called "spotting." Pirouettes may be performed in any given position, such as sur le cou-de-pied, en attitude, en arabesque, à la seconde, etc.
www.abt.org/education/dictionary/terms/pirouette.htmlThere's a video of one here.