(ˈ)tōr|ȯid ə l adjective
Etymology: New Latin tor us + English -oidal
: of, relating to, or shaped like a torus or toroid : doughnut-shaped
a toroidal resistance coil
the circulation in the atomic fireball develops a toroidal form, with an updraft in the middle and a downdraft around the outside — W.W.Kellogg
• to·roi·dal·ly - ə lē adverb