flyweight

1. (mechanics) A weight that moves outward depending on centrifugal force.

2. (martial arts) A weight class in many combat sports; e.g. in professional boxing of a maximum of 112 pounds or 50.8 kilograms.

3. (figuratively, adjectival use) Small, light or unimportant.Examples: "The characters of "Sex and the City 2" are flyweight bubbleheads living in a world which rarely requires three sentences in a row."figuratively