|eflə|res intransitive verb
( -ed/-ing/-s )
Etymology: Latin efflorescere, from ex- + florescere to begin to blossom — more at florescence
1.
a. obsolete : blossom
b. : to burst forth or become manifest as if flowering
2. chemistry
a. : to change on the surface or throughout to a whitish mealy or crystalline powder from the loss of water of crystallization on exposure to the air
Glauber's salt effloresces
b. : to become covered with a powdery crust or hard coating
bricks may effloresce owing to the deposition of soluble salts