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Definition of mycroft in English English dictionary
- Mycroft Holmes
- A fictional character, the brother of Sherlock Holmes in the books by Sir Arthur Conan Doyle
- Mycroft Holmes
- the elder brother of Sherlock Holmes, who appears in some of the stories written by Sir Arthur Conan Doyle. Mycroft, who is older than Sherlock, is cleverer than his younger brother but too lazy to be a detective