Definition of "trass" []

• A light-colored tuff used in hydraulic cement. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He proposed to neutralise this action by adding to the mortar materials rich in silica, such as trass, which would combine with the lime."
• "In Indonesia, the introduction of lime-trass binder using labour-intensive, small-scale technologies has proved beneficial to the needs of the low-income population."
• "· Wood waste, mixed with inorganic materials (cement, trass, lime, pozzolana) in a mixer/pulper machine, produce pulp cement boards for various non-loadbearing uses."