Definition of efflorescence

• n. - Flowering, or state of flowering; the blooming of flowers; blowth.
• n. - A redness of the skin; eruption, as in rash, measles, smallpox, scarlatina, etc.
• n. - The formation of the whitish powder or crust on the surface of efflorescing bodies, as salts, etc.
• n. - The powder or crust thus formed.