adjective Anatomy.
anterior to, situated in, or pertaining to the anterior part of a frontal structure.

1850–55; pre- + frontal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
prefrontal (priːˈfrʌntəl)
situated in, involving, or relating to the foremost part of the frontal lobe of the brain

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

prefrontal pre·fron·tal (prē-frŭn'tl)

  1. Of, relating to, or situated in the anterior part of the frontal lobe.

  2. Situated anterior to the frontal bone.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Among teenagers, for instance, the prefrontal cortex still has much growing up
  to do.
The part of the brain doing this trick is the newest part of the brain-it's the
  prefrontal cortex, part of the prefrontal lobe.
Instead, they are sent to the prefrontal cortex for longer-term storage.
The prefrontal cortex is only the latest phase of that evolution.
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