adjective Biology.
of or pertaining to a septum.

1830–40; sept(um) + -al1

preseptal, adjective
superseptal, adjective
transseptal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
septal (ˈsɛptəl)
of or relating to a septum

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

septal sep·tal (sěp'təl)
Of or relating to a septum or septa.

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
Positive reinforcement produced by electrical stimulation of septal area and
  other regions of rat brain.
The inferior border is thicker than the posterior, and serves for the
  attachment of the septal cartilage of the nose.
Ventricular septal defect describes one or more holes in the wall that
  separates the right and left ventricles of the heart.
For example, damage to the the lining of the septal cartilage can result in a
  collection of blood forming inside the nose.
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