• Webster's Revised Unabridged Dictionary
    • n Fenks fĕṉks The refuse whale blubber, used as a manure, and in the manufacture of Prussian blue.
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Century Dictionary and Cyclopedia
    • n fenks The ultimate refuse of whale-blubber. It is valued as a manure, and it has been proposed to use it for making Prussian blue, as also for the production of ammonia.
    • ***
Chambers's Twentieth Century Dictionary
    • n Fenks fengks the refuse of whale-blubber
    • Fenks Also Finks
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In literature:

Fenk kept up one continued laugh at me as a dauphin.
"Hesperus or Forty-Five Dog-Post-Days Vol. II" by Jean Paul Friedrich Richter
The paper is Fenk's Marforio and Pasquino, who give out his satirical medicines.
"The Invisible Lodge" by Jean Paul