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| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |

Umber - Brown earthen mineral used in coloring glaze and clay in ceramics and pottery.

Undercut - An overhang or protrusion of a relatively smooth plane that hinders removal of the mold. Undercuts must be worked around when mold making and casting.

Urethane - Ethyl ester of carbonic acid used as a solvent in an anti-plastic agent. Used in molds and casting material.