noun, plural cerebellums, cerebella [ser-uh-bel-uh] . Anatomy, Zoology.
a large portion of the brain, serving to coordinate voluntary movements, posture, and balance in humans, being in back of and below the cerebrum and consisting of two lateral lobes and a central lobe.

1555–65; < Latin: brain, diminutive of cerebrum; see cerebrum; for formation, see castellum

cerebellar, adjective
postcerebellar, adjective
precerebellar, adjective
subcerebellar, adjective
supercerebellar, adjective
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World English Dictionary
cerebellum (ˌsɛrɪˈbɛləm)
n , pl -lums, -la
one of the major divisions of the vertebrate brain, situated in man above the medulla oblongata and beneath the cerebrum, whose function is coordination of voluntary movements and maintenance of bodily equilibrium
[C16: from Latin, diminutive of cerebrum]

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Word Origin & History

1565, from L. cerebellum, dim. of cerebrum (see cerebral).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

cerebellum cer·e·bel·lum (sěr'ə-běl'əm)
n. pl. cer·e·bel·lums or cer·e·bel·la (-běl'ə)
The trilobed structure of the brain, lying posterior to the pons and medulla oblongata and inferior to the occipital lobes of the cerebral hemispheres, responsible for the regulation and coordination of complex voluntary muscular movement and the maintenance of posture and balance.

cer'e·bel'lar (-běl'ər) adj.
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American Heritage
Science Dictionary
cerebellum   (sěr'ə-běl'əm)  Pronunciation Key 
Plural cerebellums or cerebella
The part of the vertebrate brain that is located below the cerebrum at the rear of the skull and that coordinates balance and muscle activity. In mammals, the cerebellum is made up of two connecting hemispheres that consist of a core of white matter surrounded by gray matter.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
cerebellum [(ser-uh-bel-uhm)]

The part of the brain that helps control muscle coordination.

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
Three large structures stand out: the cerebrum, the cerebellum and the brain
The posterior fossa is a small space in the skull, found near the brain stem
  and cerebellum.
Fortunately, although much about the cerebellum is mysterious, enough is known
  for such features to have been identified.
Surgery may be needed, especially if there is bleeding in the cerebellum.
Images for cerebellum
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