Ef`flo*res"cence (?), n. [F. efflorescence.]
Flowering, or state of flowering; the blooming of flowers; blowth.
A redness of the skin; eruption, as in rash, measles, smallpox, scarlatina, etc.
3. Chem. (a)
The formation of the whitish powder or crust on the surface of efflorescing bodies, as salts, etc.
The powder or crust thus formed.
© Webster 1913.