a torus is a form of:

Spar



noun
1.
(any shiny crystalline mineral that splits easily into flakes) ឈើប្រើធ្វើដងក្ដោងអាវក្ដោង
verbpast tense: sparred ; past participle: sparred ; present participle: sparring ;
1.
(INTRANSITIVE) (to make the motions of attack and defense with the arms and fists, fight with the feet or spurs, bandy words, dispute) វាយគ្នា, ប្រយុទ្ធ boxers spar ជន្លដាល spar with words ឆ្លើយឆ្លងដាក់គ្នា
ENGLISH MEANING
noun
1.
The bar of a gate or door.
2.
An old name for a nonmetallic mineral, usually cleavable and somewhat lustrous; as, calc spar, or calcite, fluor spar, etc. It was especially used in the case of the gangue minerals of a metalliferous vein.
3.
A general term any round piece of timber used as a mast, yard, boom, or gaff.
4.
A contest at sparring or boxing.
5.
A movement of offense or defense in boxing.
verbpast tense: sparred ; past participle: sparred ; present participle: sparring ;
1.
(TRANSITIVE) Formerly, a piece of timber, in a general sense; -- still applied locally to rafters.
2.
(TRANSITIVE) To To supply or equip with spars, as a vessel.
3.
(INTRANSITIVE) To strike with the feet or spurs, as cocks do.
4.
(INTRANSITIVE) To use the fists and arms scientifically in attack or defense; to contend or combat with the fists, as for exercise or amusement; to box.
5.
(INTRANSITIVE) To contest in words; to wrangle.
1.
To bolt, to bar