Last modified on 9 January 2014, at 07:30

WD-40

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EnglishEdit

EtymologyEdit

An abbreviation of "Water Displacement, 40th formula" or "40th attempt" used by Norm Larson of the Rocket Chemical Company of California, the oil's developer.

Proper nounEdit

WD-40

  1. A penetrating oil used to protect electric circuits from moisture.