Simple past tense and past participle of crystallise.(verb)
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Use "crystallised" in a sentence
"“Moping herself to death”: the phrase crystallised in his brain with such suddenness that he said it aloud."
"Since the idea crystallised five years ago, Sussman has been travelling the globe with one aim in mind: to photograph the oldest living things in the world."
"Labour trouble in Great Britain turns wholly upon the idea crystallised in the one word "profiteer.""