sep·tal

[sep-tl]
adjective Biology.
of or pertaining to a septum.

Origin:
1830–40; sept(um) + -al1

pre·sep·tal, adjective
su·per·sep·tal, adjective
trans·sep·tal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
septal (ˈsɛptəl) [Click for IPA pronunciation guide]
 
adj
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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00:10
Septal is always a great word to know.
So is quincunx. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
American Heritage
Medical Dictionary

septal sep·tal (sěp'təl)
adj.
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
Ventricular septal defect describes one or more holes in the wall that
  separates the right and left ventricles of the heart.
These disorders may include nasal polyps, nasal septal deformities, and nasal
  tumors.
The inferior border is thicker than the posterior, and serves for the
  attachment of the septal cartilage of the nose.
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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