a baglike structure in an animal, plant, or fungus, as one containing fluid.

1735–45; < Latin saccus sack1

saclike, adjective

bag, baggage, luggage, pack, sac, sack. Unabridged


[sak, sawk]
noun, plural Sacs (especially collectively) Sac.


Strategic Air Command.
Also, S.A.C. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sac (sæk)
a pouch, bag, or pouchlike part in an animal or plant
[C18: from French, from Latin saccus; see sack1]

abbreviation for
Special Area of Conservation

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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Word Origin & History

"biological pocket," 1741, from Fr. sac, from L. saccus "bag" (see sack (n.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sac (sāk)

  1. A pouch or bursa.

  2. An encysted abscess at the root of a tooth.

  3. The capsule of a tumor or the envelope of a cyst.

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
sac   (sāk)  Pronunciation Key 
A pouch or pouch-shaped structure in an animal or plant, often containing liquids. The human bladder is a sac.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

SAC definition

1. An early system on the Datatron 200 series.
[Listed in CACM 2(5):16 (May 1959)].
2. Service Access Controller.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
  1. single-attached concentrator

  2. Strategic Air Command

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences for SAC
A dacryocystectomy is the surgical removal of a part of the lacrimal sac.
If due to splash injury, it is often present only in the lower conjunctival sac.
The location of presentday cedar rapids was in the territory of the fox and sac tribes.
A cyst is a closed sac having a distinct membrane and division on the nearby tissue.
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