Absorber

A growing demand by the middle class and increasing trade between African countries act like a shock absorber for the global economic slowdown.

Source: tatoeba (11100921)

[…] these Symptoms are only curred, by such Medicines as correct the Acidity and Acrimony of the Blood, viz. When it most partakes of Acrimony by sweet diaphoretick Decoctions, or some sort of Acids, which dull and take off their corroding Edges, or when they are more Acid, by volatile Salts that carry them off by Sweat or Urine; or by Acid Absorbers, which by correcting the Acidities of the Pancreatick Juice, leave the Ferment of the Liver more predominant […]

Source: wiktionary

1756, Thomas Amory, The Life of John Buncle, Esq., London: J. Noon, Chapter 36 “Remarks on the delluge,” p. , The swallows especially must do great work in the case, if we take into their number not only very many open gulphs or chasms, the depth of which no line or sound can reach; but likewise the communications of very many parts of the sea, and of many great unfathomable lochs, with the abyss. These absorbers could easily receive what had before come out of them.

Source: wiktionary

Which can be ignited the more easily with a burning-glass, black or white paper? Black paper, since it is a much better absorber of heat.

Source: wiktionary