A three-dimensional geometric shape consisting of two pyramids joined at their bases, forming a shape like two triangular peaks pointing away from each other.
From 'di-' (two) and 'pyramid,' combining Greek roots 'pyr-' (fire) and '-amid.' The compound describes the doubled pyramidal structure.
Diamonds are basically dipyramids—two pyramids stuck base-to-base—which is why they sparkle so beautifully when cut along crystal planes that follow this natural geometry.
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