left brain

n.
The cerebral hemisphere to the left of the corpus callosum, controlling activities on the right side of the body, and in humans, usually controlling speech and language functions.

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.)

n.

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

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The noun has one meaning:

Meaning #1: the cerebral hemisphere to the left of the corpus callosum that controls the right half of the body
  Synonym: left hemisphere

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