錐すい

noun

cone; pyramid

Geometric term for a solid with a polygonal base and a point (apex). 錐体 (すいたい) is a common compound for 'cone' or 'pyramid' in medical and mathematical contexts.

• 数すう学がくの授じゅ業ぎょうで、錐すいの体たい積せきの公こう式しきを学まなんだ。

  In math class, we learned the formula for the volume of a cone/pyramid.

• この立りっ体たいは底てい面めんが四し角かく形けいの錐すいです。

  This solid is a pyramid with a quadrilateral base.