Full Definition of DUSKY. 1. : somewhat dark in color; specifically: having dark skin. 2. : marked by slight or deficient light: shadowy. â duskÂ·iÂ·ly \-kÉ-lÄ\ adverb. â duskÂ·iÂ·ness \-kÄ-nÉs\ noun. See dusky defined for English-language learners.See dusky defined for kids. ADVERTISEMENT.ull Definition of DUSKY. 1. : somewhat dark in color; specifically: having dark skin. 2. : marked by slight or deficient light: shadowy. â duskÂ·iÂ·ly \-kÉ-lÄ\ adverb. â duskÂ·iÂ·ness \-kÄ-nÉs\ noun. See dusky defined for English-language learners. See dusky defined for kids.
A prism is a three-dimensional figure with two parallel congruent faces, called bases, and lateral faces in the shape of parallelograms. Prisms are named according to the shape of their bases. A prism whose bases and lateral faces are rectangles. A rectangular prism whose faces are squares. A three-dimensional shape with two parallel congruent circular faces whose cross sections (taken parallel to these circular faces) are circular. A cone is like a pyramid with a circular base.
Triangular prisms are three-dimensional solids that have triangles for their bases and rectangles for their lateral faces. The line segment where two faces come together is an edge. The point that three edges come together is a vertex.