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.
Cite This Source Link To sacs
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
Cite This Source
Word Origin & History

"biological pocket," 1741, from Fr. sac, from L. saccus "bag" (see sack (n.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
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.
Cite This Source
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.
Cite This Source
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.
Cite This Source
Example sentences for sacs
They have facial air sacs under their skin which cushion the impact with the water.
This response leads to a filling of the alveolar sacs with exudate.
Alveoli are the small sacs in the lungs that exchange oxygen with the blood.
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature