gizzard

[giz-erd]
noun Zoology.
1.
Also called ventriculus. a thick-walled, muscular pouch in the lower stomach of many birds and reptiles that grinds food, often with the aid of ingested stones or grit.
2.
Also called gastric mill. a similar structure in the foregut of arthropods and several other invertebrates, often lined with chitin and small teeth.
3.
the innards or viscera collectively, especially the intestine and stomach.

Origin:
1325–75; Middle English giser < Old French giser, gezier (French gésier) < Vulgar Latin *gigerium; compare Latin gigeria, gizeria giblets, perhaps ultimately < Iranian; compare Persian jigar liver

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Collins
World English Dictionary
gizzard (ˈɡɪzəd)
 
n
1.  the thick-walled part of a bird's stomach, in which hard food is broken up by muscular action and contact with grit and small stones
2.  a similar structure in many invertebrates
3.  informal the stomach and entrails generally
 
[C14: from Old North French guisier fowl's liver, alteration of Latin gigēria entrails of poultry when cooked, of uncertain origin]

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

gizzard
"stomach of a bird," 1373, from O.Fr. giser, probably from V.L. *gicerium, from L. gigeria (neut. pl.) "cooked entrails of a fowl," a delicacy in ancient Rome. Parasitic -d added 1500s. Later extended to other animals, and, jocularly, to human beings.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
gizzard   (gĭz'ərd)  Pronunciation Key 
A muscular pouch behind the stomach in birds. It has a thick lining and often contains swallowed sand or grit, which helps in the mechanical breakdown of food.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

gizzard

in many birds, the hind part of the stomach, especially modified for grinding food. Located between the saclike crop and the intestine, the gizzard has a thick muscular wall and may contain small stones, or gastroliths, that function in the mechanical breakdown of seeds and other foods. In this sense, the gizzard is comparable to the teeth of other animals. A few other animals, such as earthworms and some moss animals, also have gizzardlike structures.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
These get stuck in the owl's gizzard, a part of its stomach.
Chicken liver and gizzard dinners are also available.
Little nodules of calcium form in this gland and then go to the gizzard and help grind up food.
The gizzard, which is a different organ, is hardened and can grind up food.
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