noun

• (slang, sometimes derogatory) A person who is intellectual but generally introverted.
• (informal, sometimes derogatory) One who has an intense, obsessive interest in something.
• (informal, sometimes derogatory) A member of a subculture revolving around intellectualism, technology, video games, fantasy and science fiction, comic books and assorted media. [from 1980s]
• (informal, sometimes derogatory, dated) One who is socially inept or unattractive, but often brainy; a social outcast.
• Initialism of nonerosive reflux disease.
• (computing) Alternative form of NERDS [(computing) A stack of technologies used to develop web applications.]