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septum

[sep-tuh m]
noun, plural sep·ta [sep-tuh] /ˈsɛp tə/. Biology.
  1. a dividing wall, membrane, or the like, in a plant or animal structure; dissepiment.
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Origin of septum

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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for septum

septum

noun plural -ta (-tə)
  1. biology anatomy a dividing partition between two tissues or cavities
  2. a dividing partition or membrane between two cavities in a mechanical device
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Word Origin for septum

C18: from Latin saeptum wall, from saepīre to enclose; related to Latin saepēs a fence
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for septum

n.

"partition between the nostrils," 1690s, Modern Latin, from Latin saeptum "a fence, enclosure, partition," from neuter past participle of saepire "to hedge in," from saepes "hedge, fence." Related: Septal.

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Online Etymology Dictionary, © 2010 Douglas Harper

septum in Medicine

septum

(sĕptəm)
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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

septum in Science

septum

[sĕptəm]
Plural septa
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.