Hexagonal meaning

hĕk-săg'ə-nəl
Having six sides.
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Containing a hexagon or shaped like one.
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Having three equal axes intersecting at angles of 60° in one plane and one axis of variable length that is perpendicular to the others.
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Of, or having the form of, a hexagon.
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Having a six-sided base or section.
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Designating or of a crystal system having three axes of equal length that intersect in the same plane so as to form six 60° angles and a fourth of any length that intersects the plane of the other three at a right angle.
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Having six sides.
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Relating to a crystal having three axes of equal length intersecting at angles of 60° in one plane, and a fourth axis of a different length that is perpendicular to this plane. The mineral calcite has hexagonal crystals.
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(geometry) Having six edges, or having a cross-section in the form of a hexagon.

Nuts in engineering are generally hexagonal.

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(crystallography) Having three equal axes which cross at 60° angles, and an unequal axis which crosses the others at 90° angle.
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