Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The curve traced out by points P and Pˌ which lie on lines through a fixed point A where the midpoint M of PPˌ is on a fixed line and the absolute value }PM} = the absolute value }PˌM} = the absolute value }MO}, where O is the projection of A onto that fixed line.

from The Century Dictionary and Cyclopedia

  • n. A nodal plane cubic curve which is the locus of a focus of a conic whose directrix and two tangents are given.
  • n. A curve which is the locus of intersections of two lines rotating uniformly with commensurable velocities. See also suhstrophoid.

Etymologies

Greek strophos, twisted cord (from strephein, to turn) + -oid.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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