having the form of an octahedron.

1750–60; octahedr(on) + -al1

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World English Dictionary
octahedral (ˌɒktəˈhiːdrəl)
1.  having eight plane surfaces
2.  shaped like an octahedron

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Example sentences
The octahedral site, in the center of the unit cell, is nominally empty.
The primary structural unit of this group is a layer composed of one octahedral sheet condensed with one tetrahedral sheet.
With hydrogen peroxide, the danger is oxidizing octahedral iron and changing the layer charge.
The highest octahedral symmetry oh has all the faces the same color.
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