1) Agar 2) Roux 1) Any material used to thicken 2) Cornstarch 3) Flour 4) Material 5) Stuff 6) Thickening 
A substance, such as Xanthan Gum, which, when added in low concentrations to a fluid, raises the viscosity of that fluid. (see also SALT THICKENING).
A large, round tank used in milling operations to separate solids from liquids; clear fluid overflows from the tank and rock particles sink to the bottom.