Word Origin & History
gluten
1639, "any sticky substance," from L. gluten (gen. glutinis) "glue." Used 16c.-19c. for the part of animal tissue now called fibrin; used since 1803 of the nitrogenous part of the flour of wheat or other grain; hence glutamic acid (1871), a common amino acid, and its salt, glutamate (1876). Glutinous "of the nature of glue" is c.1400 (implied in glutinosity), from L. glutinosus, from gluten.