Frustum

[Sarah]

The part of a solid next the base, formed by cutting off the,top; or the part of any solid, as of a cone, pyramid, etc., betweentwo planes, which may be either parallel or inclined to each other.

[Sarah]

1)A frustum is the portion of a solid – normally a cone or pyramid – which lies between two parallel planes cutting the solid. It is often used in maths and school work
2)Someone who is fussy and fustrated with their work or life. Normally in deep stress or in utter dislike of their doings.