[wag-uh n-hed-id]
adjective Architecture.
  1. of the form of a round arch or a semicylinder, like the cover of a wagon when stretched over the bows, as a ceiling or roof.

Origin of wagon-headed

First recorded in 1815–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018