a nearly transparent, faintly yellow, odorless, and almost tasteless glutinous substance obtained by boiling in water the ligaments, bones, skin, etc., of animals, and forming the basis of jellies, glues, and the like.
any of various similar substances, as vegetable gelatin.
a preparation or product in which such an animal or vegetable substance is the essential constituent.
an edible jelly made of this substance.
Also called gelatin slide. Theater. a thin sheet made of translucent gelatin colored with an aniline dye, placed over stage lights, and used as a color medium in obtaining lighting effects.
Also, gelatine.

1790–1800; < French gélatine < Medieval Latin gelātina, equivalent to Latin gelāt(us) frozen, thickened, past participle of gelāre (gel- freeze + -ātus -ate1) + -ina -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gelatine or gelatin (ˈdʒɛləˌtiːn, ˈdʒɛlətɪn)
1.  a colourless or yellowish water-soluble protein prepared by boiling animal hides and bones: used in foods, glue, photographic emulsions, etc
2.  an edible jelly made of this substance, sweetened and flavoured
3.  any of various substances that resemble gelatine
4.  Also called (informal): gel a translucent substance used for colour effects in theatrical lighting
[C19: from French gélatine, from Medieval Latin gelātina, from Latin gelāre to freeze]
gelatin or gelatin
[C19: from French gélatine, from Medieval Latin gelātina, from Latin gelāre to freeze]

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

1713, from Fr. gélatine "clear jelly-like substance, fish broth," from It. gelatina, from gelata "jelly," from gelare "to jell," from L. gelare "freeze" (see jelly). Gelatinous (1724) is modeled on Fr. gélatineux.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

gelatin gel·a·tin or gel·a·tine (jěl'ə-tn)
A derived protein formed by boiling collagen of animal tissues.

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
gelatin   (jěl'ə-tn)  Pronunciation Key 
An odorless, colorless protein substance obtained by boiling a mixture of water and the skin, bones, and tendons of animals. The preparation forms a gel when allowed to cool. It is used in foods, drugs, glue, and film.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The animal matter is converted by boiling into gelatin.
Use dissolved gelatin in the pulp mix for writing paper so the porous material
  won't absorb and blur ink.
Gelatin is a protein derived from collagen, the major component of the
  connective tissue of animals.
One of my favorite such cuts is beef shin, full of collagen that melts to
  gelatin and gives sheen and body to a sauce or stew.
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