Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A polyhedron having 20 faces.
Century Dictionary and Cyclopedia
- n. A solid bounded by twenty planes. In the ordinary regular icosahedron the faces are equal equilateral triangles, equally inclined each to those adjacent to it. It has 12 vertices and 30 edges, 3 edges per face, 5 edges per vertex.
Wiktionary
- n. geometry A polyhedron with twenty faces.
- n. geometry, specifically A regular icosahedron: one of the Platonic solids, all of whose faces are regular triangles
GNU Webster's 1913
- n. (Geom.) A solid bounded by twenty sides or faces.
WordNet 3.0
- n. any polyhedron having twenty plane faces
Etymologies
- From Ancient Greek εἰκοσάεδρον, from εἴκοσι ("twenty") + ἕδρα (hedra, "face of a geometrical solid"). (Wiktionary)
- Greek eikosaedron : eikosi, twenty; + -edron, -hedron. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“The icosahedron is another of the five regular, or Platonic, bodies having all their sides, angles, and planes similar and equal.”
“Then, about 10 years ago, the mathematician Reidun Twarock developed a more general theory of the geometry of viruses based on the symmetries of the icosahedron, but using shapes in six dimensions, not three.”
“I've rolled the icosahedron and painted a few miniatures myself so it only raises my charisma to be accepted by that culture.”
“The company receives more than 1 million applications a year and identifies the top candidates through a rigorous screening process that analyzes SAT scores, grade-point averages and their performance on tests with such questions as: "How many different ways can you color an icosahedron with one of three colors on each face?”
The Huffington Post: Google Hiring More Than 6,200 Workers This Year
“Join five equilateral triangles together and you have the first part of an icosahedron C.”
“Only five shapes fit the bill: the tetrahedron, the cube, the octahedron, the icosahedron and the dodecahedron, the quintet known as the Platonic solids since Plato wrote about them in the Timaeus.”
“The octahedron can be made from four cards and an icosahedron with ten of them.”
“The tetrahedron was fire, the cube earth, the octahedron air, the icosahedron water and the dodecahedron the encompassing dome.”
“This set of five polyhedra came with the faces already numbered, to make it easy to see that there were 12 sides on a dodacahedron, or 20 on an icosahedron, which made them easy to use as dice.”
“George Hart has nice pictures including an icosahedron as well.”
Lists
These user-created lists contain the word ‘icosahedron’.
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Dungeons and Dragons
Would you like to join our party? We just started a new campaign.
For more general lists about role-playing games, see brandelion's RPG and lampbane's Tales of the Dread Gazebo.dungeons and dragons, d&d, elf, orc, halfling, drow, giant, troll, kobold, rpg, d20, human and 100 more...
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Hedrons
icosidodecahedron, dodecahedron, icosahedron, large hedron coll..., tippy hedron, cubicuboctahedron, great inverted sn..., rhombihexahedron, hosohedron, infinite skew pol..., permutohedron, strombic hexecont... and 12 more...
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Just 'cause I like 'em, I
irenic, inimical, ignotism, infrangible, internecine, illumine, ingot, imposter, iconoclast, indefeasible, indefatigable, impingement and 184 more...
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Manji's Random Wordlist
The title says it all
velour, vivacity, subterfuge, sable, divination, gentry, vindication, compendium, pistons, metamorphosis, methodology, polyphony and 91 more...
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Faintheart's Words
onomatopoeia, no, terrafactive, word, faint, heart, joy, quixotic, karla, half, amp, tardis and 181 more...
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sionnach's Words
contumely, fomite, holmgang, poltroon, eleemosynary, obsidian, nugatory, grindcore, felch, recrudescent, pyx, parenteral and 3271 more...
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Favorite Words II
antipode, subsumed, maladroit, quidnunc, tonsorial, savvy, vignette, retrograde, flummoxed, ne plus ultra, icosahedron, plethora and 138 more...
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pamelad's Words
lugubrious, antediluvian, decrepitude, anomaly, regurgitate, apoplexy, prolix, incapacitate, discontinuity, bellicose, inclement, frangible and 158 more...
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Regular polyhedra
This class consists of the five Platonic solids, (the only regular convex polyhedra), and the four Kepler-Poinsot (regular starry) polyhedra.
polyhedron, platonic solid, cube, octahedron, hexahedron, tetrahedron, dodecahedron, icosahedron, dual polyhedra, symmetry groups, schläfli symbol, face and 18 more...
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Geometrics
geometric shapes
concentricity, polyhedron, spheroid, isosceles triangles, rhombus, octagonal, decagon, trapezoid, concavity, hyperbolic, heptagon, cycloid and 16 more...
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geometry
catenary, angle, ray, segment, sector, circle, chord, diameter, radius, area, perimeter, volume and 49 more...
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yearofglad's words
bildungsroman, icosahedron, defenestration, fantod, sesquipedalian, philopena, sjambok, prandial, palimpsest, logorrhea, eschatology, jodhpur and 47 more...
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mathworld
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rbuelow's Words
Tweets
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