1) Donut-shaped 2) Doughnut shaped 3) Doughnutlike 4) Solid 
Toroidal describes something which resembles or relates to a torus or toroid: ...
<radiobiology> In the shape of a torus, or doughnut. Or: Coordinate indicating which part of the torus a particle is in. (Azimuthal coordinate, toroidal angle, etc.) Or: General term referring to toruses as opposed to other geometries. (for example, tokamaks and stellarators are examples of toroidal devices.) ... (09 Oct 1997) ... 
[adj] - of or relating to or shaped like a toroid
adjective of or relating to or shaped like a toroid; doughnut shaped