The process by which a substance in a liquid or solution forms an ordered solid crystal, or the action of causing such crystallization.
溶液をゆっくり冷やすと塩が結晶化した。
When the solution was cooled slowly, the salt crystallized.
不純物を除くために再結晶化（再結晶化する）が行われた。
Recrystallization was performed to remove impurities.
蛋白質の結晶化はX線構造解析に不可欠なステップだ。
Protein crystallization is an essential step for X‑ray structural analysis.