the first British stamp for sticking on envelopes. It was introduced in 1840, and its value was one penny, which was the cost of sending a letter by post in Britain. The stamp shows the head of Queen Victoria on a dark background, and stamp collectors consider it to be very important, although it is not the rarest British stamp.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
Dictionary pictures of the day
Do you know what each of these is called?
Click on any of the pictures above to find out what it is called.