from The Century Dictionary and Cyclopedia
- n. A roof that has two equal inclined planes or sides, in contradistinction to a pent-roof or lean-to roof.
Sorry, no etymologies found.
Tomatoes, from the small suburban greenhouse to the vast span-roof, hundreds of feet in length, devoted to their culture in the Channel
During the remainder of the year, they occupy a three-quarter span-roof house, in which an intermediate temperature is maintained.
"In the winter of 1863-4, I finished two span-roof houses, each 60 feet in length, with water tanks three feet in width, running entirely around on both sides of each house, and heated by a single furnace.