frontal lobe

noun Anatomy.
the anterior part of each cerebral hemisphere, in front of the central sulcus.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frontal lobe
anatomy the anterior portion of each cerebral hemisphere, situated in front of the central sulcus

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

frontal lobe n.
The largest portion of each cerebral hemisphere, anterior to the central sulcus.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
frontal lobe   (frŭn'tl)  Pronunciation Key 
The largest and forwardmost lobe of each cerebral hemisphere, responsible for the control of skilled motor activity, including speech. Mood and the ability to think are also controlled by the frontal lobe.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Previous studies of novelty-seeking behaviour suggest that it is managed by the
  brain's right frontal lobe.
The frontal lobe is responsible for high-level executive function and attention.
It can take up to twenty-one years to grow a fully functioning pre-frontal
  lobe, apparently.
Other great apes have a frontal lobe, fairly well developed, but not nearly as
  well developed as our own.
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