irregular prism

Noun

irregular prism (plural irregular prisms)

1. a prism whose cross section is an irregular polygon
   • A right prism, having regular polygons for its terminating planes, is said to be regular ; an irregular prism is one in which the ends are irregular polygons.1867, William Chambers, Robert Chambers, Chambers's Information for the People, page 652
   • If the base be an irregular polygon of any number of sides, the prism is then called an irregular prism.1806, Peter Jonas, The Genuine Art of Gauging Made Easy and Familiar, page 138
2. a solid that is like a prism but whose cross section is not (necessarily) a polygon
   • If the base be a triangle, it is called a triangular prism; if a square, a square prism; if a pentagon, a pentagonal prism; and' if the base is any irregular figure, it is called an irregular prism : ...1850, John Radford Young, An introductory treatise on mensuration, in theory and practice, page 115
   • Irregular prisms have a cross-section with no well known shape. Some of the steel sections used in the construction industry belong to this category.2016, Kusum Wadhwa, Anju Loomba, Saraswati Mathematics, Saraswati House Pvt Ltd, →ISBN, page 234