Today's word is strapontin, perhaps best defined by context in the opening paragraph of John O'Hara's "Over the River and Through the Wood:"
Mr. Winfield's hat and coat and bag were in the hall of his flat, and when the man downstairs phoned to tell him the car was waiting, he was all ready.
He went downstairs and said hello to Robert, the giant Negro chauffeur, and handed Robert the bag, and followed him out to the car.
For the first time he knew that he and his granddaughter were not to make the trip alone, for there were two girls with Sheila, and she introduced them: "Grandfather, I'd like to have you meet my friends.
This is Helen Wales, and this is Kay Farnsworth.
My grandfather, Mr. Winfield."
The names meant nothing to Mr. Winfield.
What did mean something was that he was going to have to sit on the strapontin, or else sit outside with Robert, which was no good.
Not that Robert wasn't all right, as chauffeurs go, but Robert was wearing a raccoon coat, and Mr. Winfield had no raccoon coat. So it was sit outside and freeze or sit on the little seat inside.