How do you spell Efflorescence

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