brain
UK: breɪn | US: breɪn
n. the organ inside the head that controls thought, memory, and bodily functions
n. intellectual capacity or intelligence (e.g., "She has a brilliant brain.")
n. (informal) a very intelligent person (e.g., "He’s the brain behind the project.")
The word "brain" traces back to Old English brægen, meaning "the organ of thought." It shares roots with Old Frisian brein and Middle Dutch brein, all likely derived from Proto-Germanic bragną. Unlike many scientific terms, "brain" is a compact, ancient Germanic word without clear separable morphemes in modern English. Its evolution reflects the early Germanic focus on the physical organ rather than abstract divisions of function.
The human brain processes information at incredible speeds.
She used her brain to solve the complex puzzle.
He suffered a severe injury to his brain in the accident.
The team’s success was due to the creative brains behind the project.
Meditation can help calm and focus the brain.