Xs

(2Xs 2×4 siding) The X is short for by such as a 2 by 4 inch plank can be indicated by a 2X4 inch plank.

Xylol

An aromatic hydrocarbon which is distilled from coal tar. It is used as a solvent for synthetic resins and gums.

Vitreous clay

A clay with a glazed surface that will not absorb water. Vitreous clay tile liners are usually installed in fireplace flues of site fabricated fireplaces.

Vulnerability

A measure of the possibility of something occurring

Wainscot

The wooden paneling of the lower part of an interior wall up to the dado height in a room.