Certs is a breath mint! No, Certs is a candy mint!...Wait a minute. You're both right.

I think possibly all of these explanations have been correct.
Steve & JBD's "auxiliary contact" certainly makes sense for the application here. (Example= full voltage motor starter. When an aux. contact is used to control another device it would be dry. When used as a holding contact it would be wet)
Neither AL nor IEEE publish balderdash, so the DC explanation must apply.
My Stepdad taught me about dry/wet contacts as I explained them in about 1965. My answers are verifiable also, and still apply.
Anybody agree?