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What does WD-40 stand for?

WD-40 stands for Water Displacement (40th Attempt)

This definition appears very frequently and is found in the following Acronym Finder categories:

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Samples in periodicals archive:

Silverstone is also to carry out work throughout the winter to improve drainage and water displacement systems of the non-Tarmac car parks.
The UT pigs are bi-directional in design and used primarily for air and water displacement applications during the pressure test stage of construction.
A variation of the water displacement technique, and one that avoids the surface tension problem, is to first take a cast of the residual limb, with the practitioner applying minimal tension to the bandage during wrapping, or, alternatively, to take a cast using an alginate casting technique.