Geom. [ad. F. strophoïde, f. Gr. στρόφος twisted cord: see -OID.] (See quot. 1880.) Hence Strophoidal a. and sb.
1880. W. W. Johnson, in Amer. Jrnl. Math., III. 320. The term Strophoid has been applied by French writers to a cubic curve, of which the symmetrical form has been discussed by Dr. James Booth under the name of the Logocyclic Curve…. I have ventured to use the word in a more extended signification, and define the strophoid as the locus of the intersection of two straight lines which rotate uniformly about two fixed points in a plane.
1883. E. Barnes, in Johns Hopkins Univ. Circular, II. 145. A Note on the Strophoids.
1908. Roy. Soc. Catal. Sci. Papers, Subj. Index, I. 535/1. Strophoid [several refs. to foreign periodicals]. Ibid., 535/2. Strophoidal curves of 3rd degree. Ibid., 631/2. Logocyclic curve … or strophoid. Ibid., 632/2. Strophoidals.
