brain.
The control center of the central nervous system of an animal located in the skull, consisting of the cerebrum, cerebellum, and brainstem, which is responsible for perception, cognition, attention, memory, emotion, and action.
Meaning & usage
The control center of the central nervous system of an animal located in the skull, consisting of the cerebrum, cerebellum, and brainstem, which is responsible for perception, cognition, attention, memory, emotion, and action.
The control center of the central nervous system of an animal located in the skull, consisting of the cerebrum, cerebellum, and brainstem, which is responsible for perception, cognition, attention, memory, emotion, and action. A part of the brain, especially associated with particular mental functions, abilities, etc.
The control center of the central nervous system of an animal located in the skull, consisting of the cerebrum, cerebellum, and brainstem, which is responsible for perception, cognition, attention, memory, emotion, and action. skull; head
Mind.
I have too much on my brain today.
Intellect.
She has a lot of brains.
An intelligent person.
She was a total brain.
An intelligent person. A person who provides the intelligence required for something.
He is the brains behind the scheme.
An intelligent person. An intellectual or mental capacity.
Gerald always acts like he doesn't have a brain.
By analogy with a human brain, the part of a machine or computer that performs calculations.
The computer's brain is capable of millions of calculations a second.
Oral sex.
A loose compartment of a backpack that straps on over the top opening.
Where this word comes from
Etymology tree Proto-Indo-European *mregʰ- Proto-Indo-European *-n̥ Proto-Indo-European *mrógʰ-n̥ ~ *mrégʰ-n̥-s Proto-Germanic *bragną Proto-West Germanic *bragn Old English bræġn Middle English brayn English brain Inherited from Middle English brayn, from Old English bræġn, from Proto-West Germanic *bragn, from Proto-Germanic *bragną, from Proto-Indo-European *mrógʰ-n̥ ~ *mrégʰ-n̥-s, from *mregʰ- + *-n̥. Cognate with Scots braine, brane (“brain”), North Frisian brayen, brein, Brain (“brain”), Saterland Frisian Brainge, Bräienge (“brain”), West Frisian brein (“brain”), Dutch brein (“brain”), Low German Brägen, Bregen (“brain”) (whence German Bregen (“animal brain”)), Ancient Greek βρεχμός (brekhmós, “front part of the skull, top of the head”).
To dash out the brains of; to kill by smashing the skull.
To strike (someone) on the head.
To destroy; to put an end to.
To conceive in the mind; to understand.
To think effectively.
My brain isn't braining right now.
Where this word comes from
Etymology tree Proto-Indo-European *mregʰ- Proto-Indo-European *-n̥ Proto-Indo-European *mrógʰ-n̥ ~ *mrégʰ-n̥-s Proto-Germanic *bragną Proto-West Germanic *bragn Old English bræġn Middle English brayn English brain Inherited from Middle English brayn, from Old English bræġn, from Proto-West Germanic *bragn, from Proto-Germanic *bragną, from Proto-Indo-European *mrógʰ-n̥ ~ *mrégʰ-n̥-s, from *mregʰ- + *-n̥. Cognate with Scots braine, brane (“brain”), North Frisian brayen, brein, Brain (“brain”), Saterland Frisian Brainge, Bräienge (“brain”), West Frisian brein (“brain”), Dutch brein (“brain”), Low German Brägen, Bregen (“brain”) (whence German Bregen (“animal brain”)), Ancient Greek βρεχμός (brekhmós, “front part of the skull, top of the head”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.