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to congeal; to gelatinize; to jellify; to jell; to gell; to freeze
「凝る」 has other readings with different meanings.
彼はインテリアに凝っていて部屋が素敵だった。
He was particular about interior design and his room was lovely.
料理に凝り始めてから毎日自炊するようになった。
Since getting into cooking, I started cooking for myself every day.
最近彼女はカメラに凝っていて写真撮影に熱心だ。
Recently she's into cameras and is enthusiastic about photography.