tilt roof

from The Collaborative International Dictionary of English v.0.48
Tilt \Tilt\ (t[i^]lt), n. [OE. telt (perhaps from the Danish),
   teld, AS. teld, geteld; akin to OD. telde, G. zelt, Icel.
   tjald, Sw. t[aum]lt, tj[aum]ll, Dan. telt, and AS. beteldan
   to cover.]
   1. A covering overhead; especially, a tent. --Denham.
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   2. The cloth covering of a cart or a wagon.
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   3. (Naut.) A cloth cover of a boat; a small canopy or awning
      extended over the sternsheets of a boat.
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   {Tilt boat} (Naut.), a boat covered with canvas or other
      cloth.

   {Tilt roof} (Arch.), a round-headed roof, like the canopy of
      a wagon.
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