Any substance added to something in order to thicken it; a thickening agent.
Thickener Sentence Examples
Gum tragacanth is used in calico-printing as a thickener of colours and mordants; in medicine as a demulcent and vehicle for insoluble powders, and as an excipient in pills; and feltsetting and mending beetles and other insect specimens.
Temperature resistant, inert base oils and a new type of thickener are blended to form a soft, white lubricating grease.
The okra serves as a thickener so you don't need to add roux to this gumbo.