constricˈtion noun

1. The process of narrowing or pressing together
2. Contraction
3. Tightness
4. Something constricted
5. (in a chromosome) a narrow, localized region, normally found at the centromere and elsewhere including the nucleolar-organizing region

constrictˈive adjective

constrictˈor noun

1. Something that constricts or draws together
2. A muscle that compresses an organ or hollow structure
3. A snake that crushes its prey in its coils