to·roid 
(tôroid′)
(tôroid′)n.
1. Mathematics
a. A surface generated by a closed curve rotating about, but not intersecting or containing, an axis in its own plane.
b. A solid having such a surface.
2. A body having the shape of a toroid.
[TOR(US) + -OID.]
to·roidal (tô-roidl) adj.