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olfactory groove

n.
  1. The sagittal groove on the lower or orbital surface of each frontal lobe of the cerebrum, demarcating the straight gyrus from the orbital gyri.olfactory sulcus
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.