[suh-ree-bruhm, ser-uh-]
noun, plural cerebrums, cerebra [suh-ree-bruh, ser-uh-] . Anatomy, Zoology.
the anterior and largest part of the brain, consisting of two halves or hemispheres and serving to control voluntary movements and coordinate mental actions.
the forebrain and the midbrain.

1605–15; < Latin: brain; akin to cranium, horn

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World English Dictionary
cerebrum (ˈsɛrɪbrəm)
n , pl -brums, -bra
1.  See telencephalon the anterior portion of the brain of vertebrates, consisting of two lateral hemispheres joined by a thick band of fibres: the dominant part of the brain in man, associated with intellectual function, emotion, and personality
2.  the brain considered as a whole
3.  the main neural bundle or ganglion of certain invertebrates
[C17: from Latin: the brain]

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Word Origin & History

1615, from L. cerebrum "brain" (see cerebral).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cerebrum cer·e·brum (sěr'ə-brəm, sə-rē'-)
n. pl. cer·e·brums or cer·e·bra (-brə)
The largest portion of the brain, including practically all the parts within the skull except the medulla, pons, and cerebellum and now usually referring only to the parts derived from the telencephalon and including mainly the cerebral hemispheres that are joined at the bottom by the corpus callosum. It controls and integrates motor, sensory, and higher mental functions, such as thought, reason, emotion, and memory.

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American Heritage
Science Dictionary
cerebrum   (sěr'ə-brəm, sə-rē'brəm)  Pronunciation Key 
Plural cerebrums or cerebra
The largest part of the vertebrate brain, filling most of the skull and consisting of two cerebral hemispheres divided by a deep groove and joined by the corpus callosum, a transverse band of nerve fibers. The cerebrum processes complex sensory information and controls voluntary muscle activity. In humans it is the center of thought, learning, memory, language, and emotion.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
cerebrum [(ser-uh-bruhm, suh-ree-bruhm)]

The largest part of the brain, consisting of two lobes, the right and left cerebral hemispheres. The cerebrum controls thought and voluntary movement. (See cerebral cortex, left brain, and right 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
The cerebrum is the uppermost and largest part of the brain.
When she turned eight, she started on the piano, which taught discipline and
  developed the cerebrum.
Damage to the cerebrum of the brain and malnutrition may cause some cases.
All of these thoughts were racing through my cerebrum at the same moment.
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