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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.