a character from the US television programme Star Trek. Mr Spock is a man from an imaginary planet called Vulcan, who has pointed ears and green blood, and is always completely logical, so that his ideas and decisions are based only on facts, not on emotions.
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.