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suint

suint
  (swɪnt)
  [ad. F. suint, earlier suing, f. suer to sweat, with an indeterminate suffix.]
  The natural greasy substance in the wool of sheep, consisting of fatty matter combined with potash salts: called also yolk.

1791 Hamilton Berthollet's Dyeing I. i. ii. i. 125 Wool is naturally covered with a kind of grease called suint. 1874 Crookes Dyeing & Calico-Printing 84. 1875 Knight Dict. Mech. 1549/2 In cleansing wool from the suint. 1885 Bowman Struct. Wool Fibre 179 Formerly this suint was looked upon as a kind of soap, because it was soluble in water.

Oxford English Dictionary

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