Definition of Brain

1. Noun. That part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord.

2. Verb. Hit on the head. "The fighter managed to brain his opponent"
Generic synonyms: Hit

3. Noun. Mental ability. ; "He's got plenty of brains but no common sense"
Exact synonyms: Brainpower, Learning Ability, Mental Capacity, Mentality, Wit
Generic synonyms: Intelligence
Derivative terms: Brainy, Mental, Mental

4. Verb. Kill by smashing someone's skull.
Generic synonyms: Kill

5. Noun. That which is responsible for one's thoughts and feelings; the seat of the faculty of reason. "I couldn't get his words out of my head"
Exact synonyms: Head, Mind, Nous, Psyche
Generic synonyms: Cognition, Knowledge, Noesis
Specialized synonyms: Noddle, Tabula Rasa, Ego, Unconscious, Unconscious Mind, Subconscious, Subconscious Mind
Derivative terms: Mind, Psychic, Psychical

6. Noun. Someone who has exceptional intellectual ability and originality. "He's smart but he's no Einstein"
Exact synonyms: Brainiac, Einstein, Genius, Mastermind
Generic synonyms: Intellect, Intellectual
Specialized synonyms: Prodigy
Derivative terms: Brainy

7. Noun. The brain of certain animals used as meat.
Generic synonyms: Organs, Variety Meat
Specialized synonyms: Calf's Brain

Definition of Brain

1. n. The whitish mass of soft matter (the center of the nervous system, and the seat of consciousness and volition) which is inclosed in the cartilaginous or bony cranium of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three segments, the fore-, mid-, and hind-brain.

2. v. t. To dash out the brains of; to kill by beating out the brains. Hence, Fig.: To destroy; to put an end to; to defeat.

Definition of Brain

1. Noun. 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. ¹

2. Noun. An intelligent person. ¹

3. Noun. (context: English pluralia tantum) A person who provides the intelligence required for something. ¹

4. Noun. (in the plural) Intellect. ¹

5. Noun. By analogy with a human brain, the part of a machine or computer that performs calculations. ¹

6. Verb. (slang transitive) To strike (someone) on the head. ¹

7. Verb. (transitive) To kill (a person) by smashing that person's skull. ¹

¹ Source:

Definition of Brain

1. to hit on the head [v -ED, -ING, -S]

Medical Definition of Brain

1. One of the two components of the central nervous system, the brain is the centre of thought and emotion. It is responsible for the coordination and control of bodily activities and the interpretation of information from the senses (sight, hearing, smell, etc.). (22 May 1997)

Brain Pictures

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Lexicographical Neighbors of Brain

brain (current term)
brain-derived growth factor
brain-derived neurotrophic factor
brain-heart infusion agar
brain-specific kinase

Literary usage of Brain

Below you will find example usage of this term as found in modern and/or classical literature:

1. Monographic Medicine by William Robie Patten Emerson, Guido Guerrini, William Brown, Wendell Christopher Phillips, John Whitridge Williams, John Appleton Swett, Hans Günther, Mario Mariotti, Hugh Grant Rowell (1916)
"Parasites of the brain Echinococcus is fully considered in the preceding chapter ... The cysticercus cellulosae is rarely found in the brain in the United ..."

2. Anatomy: Descriptive and Surgical by Henry Gray (1897)
"It is divided into several parts, for a escription of which reference must be made to the account of the structure of e brain in a subsequent portion of ..."

3. The Popular Science Monthly (1884)
"Few but physicians read it as indicating a connection between body and mind, by means of which we can make, or help to make, a good healthy brain by making ..."

4. Proceedings of the Royal Society of London by Royal Society (Great Britain) (1892)
"The Temperature of the brain, especially in relation to Psychical Activity." By ANGELO Mosso, Professor of Physiology in the University of Turin. ..."

5. The Scientific Monthly by American Association for the Advancement of Science (1916)
"whale's brain considerably exceeds that of the male human brain, ... Hence it would seem rash to attach much, importance to absolute brain size in comparing ..."

6. The Lancet (1839)
"Whether or not it be admitted that softening and ulcération of the brain are both the result of the same primary agency upon the organ, it appears, I thick, ..."

7. The American Journal of Psychology by Edward Bradford ( Titchener, Granville Stanley Hall (1918)
"brain one-third the size of the man brain, has neither the area nor the development of the other. The man brain is a thought brain, but, in the chimpanzee, ..."

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