Having twenty equal sides or faces.

One which is shaped as an icosahedron.

A twenty-sided polyhedron. Many viral capsids take icosohedral forms - the twenty-sided crystalline shape is the most efficient shape that can be built from the smallest number and size of capsomeres, conserving host cell energy for the production of more viruses.

Introduced in the early 1970's, this is the most popular type of dimple pattern in use today. The pattern arranges the dimples into 20 triangular groups, allowing the same air pressure on all parts of the balls as it flies through the air, reducing wind resistance.

of or relating to an icosahedron