left brain

noun
the cerebral hemisphere on the left side of the corpus callosum, controlling activity on the right side of the body: in humans, usually showing some degree of specialization for language and calculation.
Compare right brain.
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Collins
World English Dictionary
left brain
 
n
a.  the left hemisphere of the human brain, which is believed to control linear and analytical thinking, decision-making, and language
 b.  (as modifier): a left-brain activity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

left brain n.
The cerebral hemisphere to the left of the corpus callosum, controlling the right side of the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
left brain   (lěft)  Pronunciation Key 
The cerebral hemisphere located on the left side of the corpus callosum. The left brain controls activities on the right side of the body, and in humans, usually controls speech and language functions. The thought processes of logic and calculation are generally associated with the left brain.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

left brain definition


A popular term that describes the analytic, rational, and straight-line-thinking functions of the left half of the cerebral cortex. (Compare right brain; see brain.)

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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Example sentences
Teachers cannot afford to ignore the research findings on right and left brain functions.
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