brain
A1Neutral; used across all registers from informal to formal, technical to everyday.
Definition
Meaning
The organ inside the skull of vertebrates that controls thought, memory, feeling, and physical activity.
Intellectual capacity or intelligence; the mind; a person providing intelligence or ideas; the central processing unit or core of a system.
Linguistics
Semantic Notes
The word encompasses both the biological organ and the abstract concept of intellect or the source of ideas. It can be used both countably ('a brilliant brain') and uncountably ('brain tissue'), with a plural form for multiple organs or, informally, for multiple intelligent people ('the best brains in the company').
Dialectal Variation
British vs American Usage
Differences
Usage is virtually identical. Minor differences exist in some idiomatic phrasings (e.g., 'brain drain' is slightly more common in UK media contexts historically).
Connotations
Identical in core meaning. Both use 'brain' as slang for a very intelligent person.
Frequency
Equally high frequency in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
have + a + ADJ + brainuse + one's + brainthe brain + of + NPbrain + VERB (e.g., processes, controls)VERB + brain (e.g., damage, study, pick)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “on the brain”
- “brain drain”
- “brainstorm”
- “beat one's brains out”
- “blow one's brains out”
- “have a brainwave”
Usage
Context Usage
Business
Refers to intellectual capital, key personnel, or strategic thinking. 'We need the best brains working on this project.'
Academic
Refers to the biological organ, cognitive processes, or intelligence. 'The study examines neural pathways in the mammalian brain.'
Everyday
Refers to intelligence, memory, or having an idea. 'I've had that song on my brain all day.' 'Use your brain!'
Technical
Specific to neurology, anatomy, or computing (e.g., 'brain' of a computer). 'The MRI revealed no lesions on the brain.'
Examples
By Part of Speech
verb
British English
- I'll brain you if you don't stop that noise! (informal, threat)
- He brained the burglar with a candlestick.
American English
- I'm gonna brain you, kid! (informal, threat)
- The hero brained the monster with a rock.
adverb
British English
- No standard adverb form derived from 'brain'. Use 'brainlessly' from 'brainless'.
American English
- No standard adverb form derived from 'brain'. Use 'brainily' informally.
adjective
British English
- Brain science is fascinating.
- He suffered a brain injury in the crash.
American English
- Brain surgery is incredibly precise.
- The brain tumor was inoperable.
Examples
By CEFR Level
- My brain hurts after the maths test.
- Dogs have smaller brains than humans.
- Use your brain to solve the puzzle.
- Scientists are still learning how the brain stores memories.
- She's the brains behind the new marketing campaign.
- I need to pick your brain about the planning process.
- The constant stress was fogging his brain, making simple decisions difficult.
- The brain drain of skilled workers has severely impacted the country's economy.
- Advanced imaging techniques allow us to map brain activity in real time.
- The researcher posited that the phenomenon was merely a construct of the brain seeking patterns in chaos.
- His treatise on the computational theory of mind reconceptualized the brain as an information-processing system.
Learning
Memory Aids
Mnemonic
Think of a TRAIN. A TRAIN needs a central control to run smoothly, just like your body needs a BRAIN.
Conceptual Metaphor
THE MIND IS A MACHINE / COMPUTER (e.g., 'My brain isn't processing today.'); INTELLIGENCE IS A PHYSICAL OBJECT (e.g., 'He has a lot of brain.'); AN ORGANIZATION IS A BODY (e.g., 'She's the brain of the operation.').
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'ум' as 'brain' in abstract contexts like 'по уму' ('by reason'). Use 'mind' or 'intellect'.
- Russian 'мозги' is a closer colloquial match for 'brains' as intelligence, but can be cruder.
- Do not use 'brain' for 'голова' when referring to a physical headache; use 'head'.
Common Mistakes
- Using 'brains' as an uncountable noun for tissue ('brain tissue', not 'brains tissue').
- Confusing 'brain' with 'mind' in philosophical contexts.
- Incorrect article: 'He has brain of a scientist.' -> 'He has the brain of a scientist.'
Practice
Quiz
In the idiom 'to have something on the brain', what does 'brain' metaphorically represent?
FAQ
Frequently Asked Questions
It is both. Uncountable when referring to tissue or material ('brain anatomy'). Countable when referring to the organ of a specific being or, informally, an intelligent person ('a cat's brain', 'she's a brain'). The plural 'brains' often refers to intelligence ('Use your brains!') or multiple organs.
'Brain' is primarily the physical organ inside the skull. 'Mind' refers to the non-physical aspects of consciousness, thought, feeling, and perception. They are often used interchangeably in casual speech, but the distinction is important in scientific and philosophical contexts.
Yes, but it is informal and often humorous or violent. It means to hit someone hard on the head. e.g., 'I'll brain you!' (threat) or 'He brained the piñata with a stick.'
It is an idiom referring to the person who plans, organizes, and provides the intelligence for a project or activity. It highlights their role as the central, thinking part of the group.
Collections
Part of a collection
Body and Health
A1 · 49 words · Parts of the body and basic health vocabulary.