Isometrics and Isometric

Isometrics noun - Muscle-building exercises (or a system of musclebuilding exercises) involving muscular contractions against resistance without movement (the muscles contracts but the length of the muscle does not change).

Isometric is a synonym for isometrics. In some cases you can use "Isometric" instead a noun "Isometrics".

Isometric noun - A line connecting isometric points.

Isometrics is a synonym for isometric. Sometimes you can replace term "Isometrics" with "Isometric", this nouns are similar.