prismoid

[ priz-moid ]

noun

, Geometry.

1. a solid having sides that are trapezoids and bases or ends that are parallel and similar but not congruent polygons. Compare prism ( def 2 ).

prismoid

/ ˈprɪzmɔɪd /

noun

1. a prismatoid having an equal number of vertices in each of the two parallel planes and whose sides are trapeziums or parallelograms

Derived Forms

• prisˈmoidal, adjective

Other Words From

• pris·moidal adjective

Word History and Origins

Origin of prismoid¹

First recorded in 1695–1705; prism + -oid

Word History and Origins

Origin of prismoid¹

C18: from French prismoïde; see prism , -oid

Example Sentences

The length of the prismoid base L for any given sample will be a distance equal to one-half the sum of the distances to the two adjacent samples.

From Project Gutenberg

In this neighborhood, he saw on the rocky banks of the river several prismoids of basaltes, rising to the height of fifty or sixty feet.

From Project Gutenberg

The volume of ore appertaining to any given sample can be considered as a prismoid, the dimensions of which may be stated as follows:—   W = Width in feet of ore sampled.

From Project Gutenberg

The average value of a number of samples is the total metal contents of their respective prismoids, divided by the total tonnage of these prismoids.

From Project Gutenberg