円えん環かん面めん

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Meanings

1

torus; anchor ring

Technical geometry term for the doughnut-shaped surface. The cross-reference トーラス is the more common loanword.

円えん環かん面めんは、円えんをその円えんと同どう一いつ平へい面めん上じょうにない軸じくの周まわりに回かい転てんさせることで得えられる。

A torus is obtained by rotating a circle around an axis that is not in the same plane as the circle.