noun, plural septa [sep-tuh] . Biology.
a dividing wall, membrane, or the like, in a plant or animal structure; dissepiment.

1710–20; < Latin sēptum, variant of saeptum enclosure, noun use of neuter of saeptus (past participle of saepīre to fence); akin to saepēs hedge, fence Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
septum (ˈsɛptəm)
n , pl -ta
1.  biology, anatomy a dividing partition between two tissues or cavities
2.  a dividing partition or membrane between two cavities in a mechanical device
[C18: from Latin saeptum wall, from saepīre to enclose; related to Latin saepēs a fence]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"partition between the nostrils," 1698, Mod.L., from L. sæptum "a fence," from neut. pp. of sæpire "to hedge in," from sæpes "hedge, fence."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

septum sep·tum (sěp'təm)
n. pl. sep·ta (-tə)

  1. A thin partition or membrane dividing two cavities or soft masses of tissue in an organism.

  2. The septum pellucidum.

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
septum   (sěp'təm)  Pronunciation Key 
Plural septa
A thin wall or membrane that separates two parts or structures in an organism. Septae separate the chambers of the heart and subdivide the hyphae of some fungi.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The septum of his nose had cracked from the cold, bleeding a little, and
  leaving a small red icicle.
To the uninitiated, a lusty whiff of the stuff brings an uppercut to the septum.
When inhaled regularly over long periods of time, it can cause cancer of the
  lung and the septum.
The septal cartilage does not reach as far as the lowest part of the nasal
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