Origin of witch of Agnesiwitch ( translation of Italian avversiera, versiera ) ( confused with versiera curve, turning ) ( from New Latin versōria ) ( from Latin versus turned, reversed ) ( past participle of vertere to turn ; see verse 1. )Maria Gaetana Agnesi
witch of Agnesi
A segment drawn from the origin to A intersects a circle of radius a at B. The witch of Agnesi is the curve formed by P as A moves along the line C.