The Collaborative International Dictionary
Line of striction
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.
Wiktionary
line of striction
n. (context geometry English) The line on a skew surface that cuts each generator in that point of it that is nearest to the succeeding generator.