TORTUNOUS
\tˈɔːtʌnəs], \tˈɔːtʌnəs], \t_ˈɔː_t_ʌ_n_ə_s]\
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(Math.) A curve in which, any four consecutive points being taken, the fourth does not lie in the same plane as the first three, is Tortuous. The thread of a screw is a Tortuous curve. Such a curve is often called a curve of double curvature.
By Henry Percy Smith
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