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septum

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sep⋅tum

  [sep-tuhm]
Use septum in a Sentence
–noun, plural -ta  [-tuh] . Biology.
a dividing wall, membrane, or the like, in a plant or animal structure; dissepiment.
Origin:
1710–20; < L sēptum, var. of saeptum enclosure, n. use of neut. of saeptus (ptp. of saepīre to fence); akin to saepēs hedge, fence
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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sep·tum   (sěp'təm)   
n.   pl. sep·ta (-tə)
A thin partition or membrane that divides two cavities or soft masses of tissue in an organism: the nasal septum; the atrial septum of the heart.

[New Latin sēptum, from Latin saeptum, partition, from neuter past participle of saepīre, to enclose, from saepēs, fence.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

septum 
"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, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: sep·tum
Pronunciation: 'sep-t&m
Function: noun
Inflected Form: plural sep·ta /-t&/
: adividing wall or membrane especially between bodily spaces or masses of soft tissue: as a : NASAL SEPTUM b : CRURAL SEPTUM
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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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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