Usually, skimmings. something that is removed by skimming.
skimmings, Metallurgy, dross.
Slang. the practice of concealing gambling or other profits so as to avoid paying taxes, commissions, etc.

1400–50; late Middle English skemmyng. See skim, -ing1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
skimmings (ˈskɪmɪŋz)
pl n
1.  material that is skimmed off a liquid
2.  the froth containing concentrated ore removed during a flotation process
3.  slag, scum, or impurities removed from molten metals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1420 (skimmer, the utensil, is attested from c.1392), "to clear (a liquid) from matter floating on the surface," from O.Fr. escumer "remove scum," from escume (Fr. écume) "scum," from a Gmc. source (cf. O.H.G. scum "scum," Ger. Schaum; see scum). Hence, skim milk (1596),
from which the cream has been skimmed. Meaning "to glance over carelessly" (in ref. to printed matter) first recorded 1799; that of "to move over lightly and rapidly" is from 1697. Skimmer, the N.Amer. shore bird (1785), so called from its method of feeding.
Online Etymology Dictionary, © 2010 Douglas Harper
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