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brain

[breyn] /breɪn/
noun
1.
Anatomy, Zoology. the part of the central nervous system enclosed in the cranium of humans and other vertebrates, consisting of a soft, convoluted mass of gray and white matter and serving to control and coordinate the mental and physical actions.
2.
Zoology. (in many invertebrates) a part of the nervous system more or less corresponding to the brain of vertebrates.
3.
Sometimes, brains. (used with a plural verb) understanding; intellectual power; intelligence.
4.
the brain as the center of thought, understanding, etc.; mind; intellect.
5.
brains, Slang. a member of a group who is regarded as its intellectual leader or planner:
The junior partner is the brains of the firm.
6.
Informal. a very intelligent or brilliant person.
7.
Informal.
  1. the controlling or guiding mechanism in a computer, robot, pacemaker, etc.
  2. the part of a computer system for coordination or guidance, as of a missile.
verb (used with object)
8.
to smash the skull of.
9.
Slang. to hit or bang (someone) on the head.
Idioms
10.
beat one's brains out, Informal. to try very hard to understand and work out a problem, remember something, etc.:
She beat her brains out studying for the exam.
11.
have something on the brain, to have an obsession; be occupied with:
Lately I seem to have food on the brain.
12.
pick someone's brains, to obtain information by questioning another person rather than by seeking it independently:
He refused to prepare for the exam but counted on being able to pick his roommate's brains.
Origin
1000
before 1000; Middle English; Old English bræg(e)n, bregen; cognate with Low German brägen, Dutch brein
Related forms
brainlike, adjective
superbrain, noun
Synonyms
3. sense; capacity. See mind.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for have some thing on the brain

brain

/breɪn/
noun
1.
the soft convoluted mass of nervous tissue within the skull of vertebrates that is the controlling and coordinating centre of the nervous system and the seat of thought, memory, and emotion. It includes the cerebrum, brainstem, and cerebellum Technical name encephalon, related adjectives cerebral encephalic
2.
the main neural bundle or ganglion of certain invertebrates
3.
(often pl) (informal) intellectual ability he's got brains
4.
(informal) shrewdness or cunning
5.
(informal) an intellectual or intelligent person
6.
(usually pl; functioning as singular) (informal) a person who plans and organizes an undertaking or is in overall control of an organization, etc
7.
an electronic device, such as a computer, that performs apparently similar functions to the human brain
8.
on the brain, constantly in mind I had that song on the brain
9.
pick someone's brain, to obtain information or ideas from someone
verb (transitive)
10.
to smash the skull of
11.
(slang) to hit hard on the head
Word Origin
Old English brægen; related to Old Frisian brein, Middle Low German bregen, Greek brekhmos forehead
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for have some thing on the brain
brain
O.E. brægen "brain," from P.Gmc. *bragnam (cf. M.L.G. bregen, O.Fris., Du. brein), from PIE base *mregh-m(n)o- "skull, brain" (cf. Gk. brekhmos "front part of the skull, top of the head"). The custom of using the plural to refer to the substance (literal or figurative), as opposed to the organ, dates from 16c. Figurative sense of "intellectual power" is from late 14c.; meaning "a clever person" is first recorded 1914. The verb meaning "to dash the brains out" is from late 14c. Brain-dead is from 1976, popularized by the Karen Anne Quinlan case (brain death is from 1968); brain teaser is from 1923. Brain stem first recorded 1879, from German. Brain drain is attested from 1963. An O.E. word for "head" was brægnloca, which might be translated as "brain locker." In M.E., Brainsick (O.E. brægenseoc) meant "mad, addled."
Online Etymology Dictionary, © 2010 Douglas Harper
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have some thing on the brain in Medicine

brain (brān)
n.
The portion of the 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. Also called encephalon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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have some thing on the brain in Science
brain
  (brān)   

  1. 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. See more at brainstem, cerebellum, cerebrum.

  2. A bundle of nerves in many invertebrate animals that is similar to the vertebrate brain in function and position.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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have some thing on the brain in Culture

brain definition


The central organ in the nervous system, protected by the skull. The brain consists of the medulla, which sends signals from the spinal cord to the rest of the brain and also controls the autonomic nervous system; the pons, a mass of nerve fibers connected to the medulla; the cerebellum, which controls balance and coordination; and the cerebrum, the outer layer of which, the cerebral cortex, is the location of memory, sight, speech, and other higher functions.

The cerebrum contains two hemispheres (the left hemisphere and the right hemisphere), each of which controls different functions. In general, the right hemisphere controls the left side of the body and such functions as spatial perception, whereas the left hemisphere controls the right side of the body and functions such as speech.

Under the cerebral cortex are the thalamus, the main relay center between the medulla and the cerebrum; and the hypothalamus, which controls blood pressure, body temperature, hunger, thirst, sex drive, and other visceral functions.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang definitions & phrases for have some thing on the brain

brain

noun

An intelligent person; intellectual; good scholar: The publicity of being a brain did not further her movie career as a glamour girl (1914+)

verb

To injure with a hard blow to the head •Attested fr 1382 in the full sense, ''kill by knocking out the brain'': The left hook really brained him

Related Terms

birdbrain, bubble brain, have something on the brain, lamebrain, not have brain one, pick someone's brain, rattlebrain, scatterbrain


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Idioms and Phrases with have some thing on the brain
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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