- ring, halo, annulus, anulus, doughnut, anchor ring - a toroidal shape; "a ring of ships in the harbor"; "a halo of smoke"
--1 is a kind of toroid
--1 has particulars: fairy ring, fairy circle - doughnut, donut, sinker - a small ring-shaped friedcake
--2 is a kind of friedcake
--2 has particulars: raised doughnut