Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
click for a larger image


 (ī-kō′sə-hē′drən, ī-kŏs′ə-)
n. pl. i·co·sa·he·drons or i·co·sa·he·dra (-drə)
A polyhedron having 20 faces.

[Greek eikosaedron, from neuter of Greek eikosaedros, twenty-sided : eikosi, twenty; see wīkm̥tī- in Indo-European roots + -edros, -sided; see -hedron.]

i·co′sa·he′dral (-drəl) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.icosahedral - of or relating to an icosahedron
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The icosahedral phase was first discovered in 1984 by Schechtman in a rapidly solidified [Al.sub.86][Mn.sub.14] alloy [1].
Adenoviruses (AdVs) are member of the family Adenoviridae, non-enveloped with an icosahedral nucleocapsid containing double stranded DNA genome, divided into five genera: Atadenovirus, Aviadenovirus, Ichtadenovirus, Mastadenovirus and Siadenovirus (Harrach et al., 2012).
CHIKV caused widespread outbreaks of debilitating human disease in the past few years and more than 1.9 million people have been infected.2,3 CHIKV invasion of susceptible cells is mediated by two viral glycoproteins (E1 and E2) which carry the main antigenic determinants and form an icosahedral shell at the virion surface.1 The severity of CHIKV disease rigorously effect the quality of life of infected individuals for weeks, months or even years.4
Parvoviruses (family Parvoviridae) are small, nonenveloped viruses of 25-30 nm in diameter, with an icosahedral capsid.
where N is a cyclic group whose order is a factor of d and G' is a subgroup of PGL(2, C), i.e., a cyclic group [Z.sub.m], a dihedral group D2m, the tetrahedral group [A.sub.4], the octahedral group S4 or the icosahedral group [A.sub.5].
In addition, he presents some new historical hypotheses concerning the origin of the Egyptian calendar and the Babylonian numerical system with base 60 (the dodecahedral hypothesis) as well as about the origin of the Mayan calendar and numeral system with base 20 (the icosahedral hypothesis).
It is a member of the Parvoviridae family, and it's tiny, with a roughly 18 nm diameter, unenveloped icosahedral protein capsid carrying ~4700 bases of DNA.
Xia, "A water-based synthesis of octahedral, decahedral, and icosahedral Pd nanocrystals," Angewandte Chemie International Edition, vol.