Merriam-Webster's Collegiate® Dictionary, 11th Edition
GEL
I. noun
Etymology: gelatin
Date: 1899
a colloid in a more solid form than a sol, a thin colored transparent sheet used over a stage light to color it, a gelatinous preparation used in styling hair,
II. intransitive verb (gelled; gelling)
Date: 1917
to change into or take on the form of a gel ; set , jell 2, gelable adjective