Meaning of tonneau

ton•neau

Pronunciation: (tu-nō'), [key]
— pl. -neaus, -neaux
  1. a rear part or compartment of an automobile body, containing seats for passengers.
  2. a complete automobile body having such a rear part.
  3. a waterproof cover, generally of canvas or vinyl, that can be fastened over the cockpit of a roadster or convertible to protect the interior.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.