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[strof-oid, stroh-foid] /ˈstrɒf ɔɪd, ˈstroʊ fɔɪd/
noun, Geometry.
a plane curve generated by the loci of points p and pprime; on a straight line that intersects the y-axis at a point n and the minus x-axis at a fixed point q, such that pn = npprime; = on, as on changes, where o is the origin. Equation: y 2 = x 2 (x + a)/(ax).
Origin of strophoid
1875-80; < Greek stróph(os) twine + -oid, modeled on French strophoïde Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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strophoid in Science

The curve traced out by points P and P' which lie on lines through a fixed point A where the midpoint M of PP' is on a fixed line and the absolute value |PM| equals the absolute value |P'M| equals the absolute value |MO|, where O is the projection of A onto that fixed line.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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