1. A pumiceous conglomerate, a volcanic production, used as a cement.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• tresh,
• treas,
• tras,
• trase,
• tress,
• trazz,
• tresse,
• traws,
• traas,
• 6rass,
• 5rass,
• tdass,
• tfass,
• ttass,
• t5ass,
• t4ass,
• trzss,
• trazs,
• trasss,
• tradss

The plural of the "Trass" can be the "trasses".

The singular of the "Trass" can be the "Trass".