Wiktionary:Word of the day/2020/April 18

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effloresce v

(intransitive, obsolete except figuratively) To burst into bloom; to flower. (intransitive, figuratively) Of something hidden: to come forth, to emerge; also, to reach full glory or power. (intransitive, chemistry) Senses relating to chemistry. Of a substance: to change from being crystalline to powdery by losing water of crystallization. Of a salt: to seep through some material (bricks, concrete, earth, rock, etc.) in a dissolved state, and then crystallize on a surface in a powdery form. Of the surface of a material: to become covered with a powdery salt (as described in sense 3.2).

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