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Adjective: toroidal  tu'roy-d(u)l
  1. Of or relating to or shaped like a toroid; doughnut shaped
  2. (mathematics) lying in a plane perpendicular to an axis, often going around the axis
    "Axisymmetric fields are generally broken into poloidal components, whose lines of force lie in meridional planes, and toroidal components, whose lines of force form circles about the axis."

Encyclopedia: Toroidal