from The Century Dictionary.

  • See aclistous.


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  • A little used term in crystallography, literally meaning "unclosed", hence "open".

    "The forms are all open forms, and the class may be called the acleistous ditrigonal or the polar ditrigonal class: they were regarded as hemihedral with inclined faces."

    --W. J. Lewis, 1899, A Treatise on Crystallography

    January 6, 2008