X

XBAR On drawings, abbr. for “crossbar.”

X-brace, cross brace Any braces which cross each other to form the letter X.

X-bracing See cross bracing, 1.

XCU In insurance terminology, letters which refer to exclusions from coverage for property damage liability arising out of explosion or blasting (designated by X), collapse or structural damage to any building or structure (designated by C), and underground damage caused and occurring during the use of mechanical equipment (designated by U).

xenodocheum In classical architecture, a room or building devoted to the reception and accommodation of strangers or guests.

xenon lamp A lamp bulb, containing a gas called xenon, which emits light similar to daylight when excited by an arc discharge.

X HVY On drawings, abbr. for “extra heavy.”

XL Abbr. for “extra large.”

X-mark See face mark.

XSECT On drawings, abbr. for cross section.

X STR On drawings, abbr. for “extra strong.”

XXH On drawings, abbr. for “double extra heavy.”

xylol A colorless aromatic hydrocarbon liquid; used as a solvent for paints and varnishes.

xyst, xystum 1. In classical architecture, a roofed colonnade for exercise in bad weather. 2. In ancient Rome, a long, tree-shaded promenade. 3. A tree-lined walk.

xyst, 1