WordReference Random House Unabridged Dictionary of American English © 2015
left brain, 
Anatomythe 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. Cf. right brain.


Collins Concise English Dictionary © HarperCollins Publishers::

left brain n
  1. the left hemisphere of the human brain, which is believed to control linear and analytical thinking, decision-making, and language
  2. (as modifier): a left-brain activity



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