['strikʃәn]
n.
紧缩,收缩,约束

Striction \Stric"tion\, n. [L. strictio. See {Stringent}.]
The act of constricting, or the state of being constricted.

{Line of striction} (Geom.), the line on a skew surface that
cuts each generator in that point of it that is nearest to
the succeeding generator.