Gluten is a composite of the proteins gliadin and glutenin. These exist, conjoined with starch, in the endosperms of some grass-related grains, notably wheat, rye, and barley.
http://en.wikipedia.org/wiki/Gluten

GIG provides information, education and support to those with celiac disease (CD) / dermatitis hepetiformis (DH), their families, health care professionals, and the general public
http://www.gluten.net/

A gluten-free diet is recommended amongst other things in the treatment of coeliac disease and wheat allergy. It is a diet completely free of ingredients derived from gluten ...
http://en.wikipedia.org/wiki/Gluten-free_diet

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http://dictionary.reference.com/browse/gluten

gluten n. The mixture of proteins, including gliadins, found in wheat grains, that are not soluble in water and that give wheat dough its elastic
http://www.answers.com/topic/gluten