ˈstrōˌfȯid noun
( -s )
Etymology: French strophoïde , from Greek strophos twisted band (from strephein to twist) + French -oïde -oid (II) — more at strophe
: a plane curve that is generated by a point whose distance from the y-axis along a variable straight line which always passes through a fixed point is equal to the y-intercept and that has the equation ρ = α(sec θ ± tan θ) in polar coordinates