An archaic or variant spelling of 'crystal'; a clear, transparent mineral or glass-like substance with a regular geometric form.
From Old French 'cristal', derived from Greek 'krystallos' (ice), originally because transparent crystals resembled frozen ice.
Medieval manuscripts show 'crystall' constantly—it's not a mistake but the correct spelling for hundreds of years, proving that 'correct' spelling is just what a culture agrees on at any moment!
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