American Heritage Dictionary
(2)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Myocytes had central areas of cytoplasmic rarefaction, which were actin positive and desmin poor, with the reverse pattern of staining at the cell periphery.— CiteULike: Everyone's library
A first knowledge of their sense of the purity of rarefaction was given me in early years, when we had ridden far out over the rolling plains of North Syria to a ruin of the Roman period which the Arabs believed was made by a prince of the border as a desert-palace for his queen.— Belmont Club
The atmosphere being in a state of equilibrium (so the doctor told us), was ready to obey even the slightest impulse, and to rush towards any spot where rarefaction was taking place.— A Voyage round the World A book for boys
The compression caused by the admission of the puff of air into the lower parts of the pipe P will be followed by the usual rarefaction, and as this rarefaction will exhaust or suck the air from the inside of the motor M, the valve will again be lifted from its seat, and the cycle of operations will be repeated as long as the wind supply is kept up.— The Recent Revolution in Organ Building Being an Account of Modern Developments
Secondly, by mere intensity, without any addition at all; such is the case with things subject to rarefaction, as is stated in Phys. iv, text.— Summa Theologica, Part I-II (Pars Prima Secundae) From the Complete American Edition

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
You can expect to see this word about twice a year.
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