crystalline

Ancient Greeks looked at clear quartz and imagined that it was ice frozen so solid that even the summer sun could not thaw it. They called it κρύσταλλος, from a word connected with frost and the hard crust formed by freezing—a chilly origin for something now associated with glittering jewelry and laboratory precision. Greek then added -ῐνος, an adjectival tag meaning “of or like,” producing κρυστάλλινος: literally, “crystal-ish.” The word passed through Latin and Old French before appearing in English as crystalline in the late 14th century, when writers used it for both transparent purity and crystal-like material. So whenever prose is called crystalline, it carries a tiny fossil of an ancient mistake: what looked like frozen water was actually stone.