Webster's English Dictionary

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cerebellum

cer.e.bel.lum \.ser-*-'bel-*m\ \-'bel-*\ n or cerebellums or cer.e.bel.la 
   [ML, fr. L, dim. of cerebrum] pl  : a large dorsally projecting part of the 
   brain esp. concerned with the co ordination of muscles and the maintenance 
   of bodily equilibrium, situated anterior to and above the medulla which it 
   partly overlaps, and formed in man of two lateral lobes and a median lobe