tail-dragger
n.— «They began amassing more planes, paying special attention to the more versatile models that have a third wheel in back as opposed to the front—”tail-draggers,” as they call them.» —“Flying while female: Women pilots beat odds” by Eric Kurhi Contra Costa Times (California) Sept. 20, 2007. (source: Double-Tongued Dictionary)
Further reading
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This term is so common in aviation that “under documented” doesn’t really apply. I googled it and got 115,000 hits. Skipped to page 50 and the references to tailwheel equiped airplanes continued.
But can you find it in a mainstream dictionary? The argument here is that any of the conditions can apply for the term to be included here.
Also, Google hits aren’t documentation. They’re merely unvetted uses.