Architectural and Engineering Glossary

X
X HVY

 On drawings, abbr. for “extra heavy.”

X STR

On drawings, abbr. for “extra strong.” 

X-brace

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

XBAR

On drawings, abbr. for “crossbar.”

XCU

In insurance terminology, letters which refer to exclusions from coverage for property damage liability arising out of explosion or blast- ing (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.

XL

Abbr. for “extra large.”

XSECT

On drawings, abbr. for cross section. 

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 prome- nade.3.A tree lined walk.