Constriction :: Constriction (n.) The act of constricting by means of some inherent power or by movement or change in the thing itself, as distinguished from compression..
Constriction :: Constriction (n.) The state of being constricted; the point where a thing is constricted; a narrowing or binding.
Constrictive :: Constrictive (a.) Serving or tending to bind or constrict.