Longman Dictionary of Contemporary English
Wiktionary
n. A bowl kept in a bedroom to serve as a temporary toilet.
Wikipedia
A chamber pot is a bowl-shaped container with a handle, and often a lid, used as a portable toilet, especially in the bedroom at night. Variants of this were common in many cultures until the advent of indoor plumbing.
Usage examples of "chamber pot".
He kept the covers pulled up to his eyes and learned to drink nothing after supper, so that he wouldn't have to get up in the dark to use the chamber pot.
I knew when she got out of bed, when she took her bath, and even when she sat on the chamber pot.
He swallowed the last of the ale, rose, and headed back up to his room, where he used the chamber pot and set it by the door.
There was no chamber pot in the room, and neither of them had seen any sign of a jakes on the way up.
Holding it against his chest, he found a chamber pot under the bed and was in the midst of using it when the door inched open.
Then he could find a chamber pot or even an open window and go back to bed.
She was in disgrace, not in prison, and while she preferred to use the privies built up over the edge of the ramparts rather than the chamber pot, she dared not venture out alone for fear of meeting Hugh.