icosahedron

(redirected from icosahedra)
Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to icosahedra: Icosahedral symmetry

icosahedron

(ī-kō″să-hē′drŏn, kŏs″) [Gr. eikosaedron]
A nearly spherical structure made of 20 identical subunits linked at 12 symmetrical corners. Each subunit is an equilateral triangle. Several viruses, including the human immunodeficiency virus (HIV), are icosahedral.

icosahedron

20-facteted sphere, e.g. verruca virus
References in periodicals archive ?
He purified the proteins from the bacteria and developed new screening methods to determine which ones were forming icosahedra.
Here the icosahedra l motif has approximate symmetry operations that are not present in the cubic lattice.
Icosahedra also have locations around which there is threefold or twofold symmetry.