frustum['frʌstəm]n.1.■【几何学】2.■平截头体3.■平截头墩,平截头台变形n.frustumsfrusta
frustumfrustum[ˈfrʌstəm]n.(pl. frustums, -ta[-tə])1.■【数】平截体; 截头体2.■【建】柱身3.■截锥体4.■立体角frustum of a cone圆锥截体frustum of cone平截头圆锥体frustum of pyramid平截头棱锥体frustum of rectangular pyramid四棱体frustum of sphere球截角锥体frustum of wedge尖劈截角锥体