Relating to, composed of, or resembling crystals; having the ordered atomic structure characteristic of crystalline materials.
From 'crystal' + '-ic' (adjective-forming suffix), creating an alternative form to 'crystalline' for describing crystal-like properties.
Scientists originally used both 'crystallic' and 'crystalline' interchangeably, but 'crystalline' eventually won out—it's a reminder that even technical jargon has popularity contests!
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