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[ok-tuh-hee-druh n] /ˌɒk təˈhi drən/

noun, plural octahedrons, octahedra
[ok-tuh-hee-druh] /ˌɒk təˈhi drə/ (Show IPA)
a solid figure having eight faces.
noun (pl) -drons, -dra (-drə)
a solid figure having eight plane faces

1560s, from Greek oktahedron, neuter of oktahedros “eight-sided,” from okta- “eight” (see octa-) + hedra “seat” (see sedentary). Related: Octahedral.
Plural octahedrons or octahedra
A polyhedron that has eight faces.


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  • Octal forty

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  • Octal notation

    /ˈɒktəl/ noun 1. a number system having a base 8: often used in computing, one octal digit being equivalent to a group of three bits

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