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There are 4 eleven-letter words beginning with ICOS

ICOSAHEDRAL	• icosahedral adj. Of, relating to, or having the shape of an icosahedron. • ICOSAHEDRAL adj. of or having the form of an icosahedron.
ICOSAHEDRON	• icosahedron n. (Geometry) A polyhedron with twenty faces. • icosahedron n. (Geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular… • ICOSAHEDRON n. a polyhedron having 20 faces.
ICOSANDRIAN	• icosandrian adj. (Botany) Relating to the class Icosandria; having twenty or more stamens inserted in the calyx. • ICOSANDRIAN adj. belonging to the Icosandria, a class of plants, also ICOSANDROUS.
ICOSANDROUS	• icosandrous adj. (Botany) Having twenty or more stamens in each perigynous flower. • ICOSANDROUS adj. belonging to the Icosandria, a class of plants, also ICOSANDRIAN.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 8 words
Scrabble in French: 2 words
Scrabble in Spanish: no word
Scrabble in Italian: 3 words
Scrabble in German: no word
Scrabble in Romanian: 1 word

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