n. [ F. efflorescence. ] 1. (Bot.) Flowering, or state of flowering; the blooming of flowers; blowth. [ 1913 Webster ]
2. (Med.) A redness of the skin; eruption, as in rash, measles, smallpox, scarlatina, etc. [ 1913 Webster ]
3. (Chem.) (a) The formation of the whitish powder or crust on the surface of efflorescing bodies, as salts, etc. (b) The powder or crust thus formed. [ 1913 Webster ]