The rear seating compartment of an early type of automobile.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "tonneau" in a sentence
"There will be one set of batteries there, together with the motor, and another set of batteries will be placed under the removable seats in what I call the tonneau, though, of course, it isn't really that."
"There was only Helen on the front seat of the car; but in the tonneau was a bundled-up figure surmounted by what looked to be a scarlet cap which Ruth knew instantly must be Tom's."
"In the tonneau was a matronly woman and three girls including "L'Enfant Terrible," all,"