1. A white to grey volcanic tufa, formed of decomposed trachytic cinders; - sometimes used as a cement. Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water

Derived forms: trasses

Encyclopedia: Trass

• instable
• instal
• install
• installation
• installation charge
• installer
• installing
• installment
• installment buying
• installment credit
• installment debt
• installment loan
• installment plan
• installment rate
• instalment
• instance
• instancy
• instant
• instant coffee
• instant replay
• instantaneity
• instantaneous
• instantaneous sound pressure
• instantaneously
• instantaneousness