noun
clock in the clock tower of the Houses of Parliament, London
• Instance Hypernyms: ↑clock
• Part Holonyms: ↑London, ↑Greater London, ↑British capital, ↑capital of the United Kingdom
* * *
the bell in the clock tower of the Houses of Parliament in London, England.
[1890-95]
* * *
Big Ben noun
1. The bell in the clock tower of the Houses of Parliament, London
2. The tower itself
3. The clock itself
• • •
Main Entry: ↑big
* * *
Big Ben UK US
a large bell in the tower next to the Houses of Parliament in London, on which there is a clock. This name is often used for referring to the tower or its clock. 
http://www.macmillandictionary.com/med2cd/weblinks/big-ben.htm
http://www.macmillandictionary.com/med2cd/weblinks/big-ben.htmThesaurus: clocks, watches and instruments that measure timehyponym parts of clocks and watchesmeronym
* * *
Big Ben,
1. a huge bell in the clock tower of the Parliament building in London.
2. Informal. the clock itself.
* * *
the great clock tower of the Houses of Parliament in London and its bell
* * *
Big Ben [Big Ben]
the bell in the clock tower of the British ↑Houses of Parliament. Its sound is well known because it has often been used in films, and it is used on British television and radio to introduce news broadcasts. Many people think wrongly that Big Ben is the name of the clock, or of the tower itself.
Useful english dictionary. 2012.