American Heritage Dictionary
(7)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(4)
Elsewhere on the web
The ground itself was covered with a white efflorescence, which stuck to our feet, and made us slip at every step As our eyes became accustomed to the light, we discovered that we were in the midst of fungi or mushrooms of every shape and colour.— In the Wilds of Florida A Tale of Warfare and Hunting
Its surface is then covered with a white efflorescence, which resembles a heavy hoar frost; this, called salitre_, being a sort of impure saltpetre, left after the evaporation and subsidence of the floods They have entered this cheerless waste, and are about midway across it, when the cry of alarm is heard; he who gave utterance to it being older than the others, and credited with greater knowledge of things.— Gaspar the Gaucho A Story of the Gran Chaco
Something besides in that now assailing them; which sweeping across the salitral has lifted the sulphureous efflorescence, that beats into their eyes bitter and blinding as the smoke of tobacco.— Gaspar the Gaucho A Story of the Gran Chaco

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
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