Brain definition

brān
A functionally similar portion of the invertebrate nervous system.
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A brain is defined as a smart or intellectual person.

An example of brain is a student who is valedictorian of their class.

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A bundle of nerves in many invertebrate animals that is similar to the vertebrate brain in function and position.
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The definition of a brain is the mass of nerve tissue located in the head of animals with spinal cords; it is the center of thought and controls movement.

An example of brain is what is damaged when someone has Alzheimer's disease.

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The control center, as of a ship, aircraft, or spacecraft.
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The portion of the vertebrate central nervous system that is enclosed within the cranium, continuous with the spinal cord, and composed of gray matter and white matter. It is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. It is also the seat of consciousness, thought, memory, and emotion.
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A functionally similar portion of the invertebrate nervous system.
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Intellectual ability; intellect.

An actor not known for his quick brain.

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Exceptional intellectual ability; intelligence.

Has brains and good looks.

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(informal) A highly intelligent person.

We knew the new kid was a brain as soon as she started talking.

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(informal) The main organizer or planner of a group activity; chief controller or director.
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Intelligence; mental ability.
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(informal) A person of great intelligence.
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The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
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(informal) An intelligent person.

He was a total brain.

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(UK, plural only) A person who provides the intelligence required for something.

He is the brains behind the scheme.

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(in the plural) Intellect.

He has a lot of brains.

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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.

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To dash out the brains of; to kill by smashing the skull.
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(slang) To strike (someone) on the head.
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(figuratively) To destroy; to put an end to.
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To conceive in the mind; to understand.
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The primary director or planner, as of an organization or movement.
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To hit on the head or kill by hitting on the head.
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The mass of nerve tissue in the cranium of vertebrate animals, an enlarged extension of the spinal cord: it is the main part of the nervous system, the center of thought, and the organ that perceives sensory impulses and regulates motor impulses: it is made up of gray matter (the outer cortex of nerve cells) and white matter (the inner mass of nerve fibers)
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A comparable organ in invertebrate animals.
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To dash out the brains of.
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(slang) To hit hard on the head.
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The portion of the vertebrate central nervous system that is enclosed within the cranium, continuous with the spinal cord, and composed of gray matter and white matter. It is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. In humans, it is also the seat of consciousness, thought, memory, and emotion.
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The part of the nervous system in vertebrates that is enclosed within the skull, is connected with the spinal cord, and is composed of gray matter and white matter. It is the control center of the central nervous system, receiving sensory impulses from the rest of the body and transmitting motor impulses for the regulation of voluntary movement. The brain also contains the centers of consciousness, thought, language, memory, and emotion.
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beat (one's) brains (out)
  • To exert or expend great mental effort:
    She beat her brains out during the examination.
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on the brain
  • Obsessively in mind:
    The coach has winning on the brain.
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pick (someone's) brain
  • To explore another's ideas through questioning.
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(informal) rack (one's) brain
  • To think long and hard:
    I racked my brain for hours trying to recall her name.
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have on the brain
  • to be obsessed by
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pick someone's brains
  • to extract information, ideas, etc. from someone and use to one's own advantage
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Other Word Forms

Noun

Singular:
brain
Plural:
brains

Idioms and Phrasal Verbs

Origin of brain

  • Middle English from Old English brægen

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English brain, from Old English bræġen (“brain”), from Proto-Germanic *bragną (“brain”), from Proto-Indo-European *mreghmno-, *mreghmo- (“skull, brain”), from Proto-Indo-European *mreK- (“marrow, sinciput”). Cognate with Scots braine, brane (“brain”), North Frisian brayen, brein (“brain”), West Frisian brein (“brain”), Dutch brein (“brain”), Low German Brägen (“brain”), Bregen Ancient Greek βρεχμός (brechmos, “front part of the skull, top of the head”).

    From Wiktionary