Trigonal definition

trī-gōnəl
Rhombohedral.
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Of a triangle; triangular.
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Of a trigon.
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Relating to a crystal having three axes of equal length intersecting at oblique angles. This crystal system is considered a subset of the hexagonal system. The mineral quartz has trigonal crystals.
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Origin of trigonal

  • Earlier relating to a trigon or triplicity, relating to three angles Latin trigōnum triangle trigon -al

    From American Heritage Dictionary of the English Language, 5th Edition