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Webster 1913 Edition
Trass
Trass
,Noun.
(Geol.)
A white to gray 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.
[Formerly written also
tarras
, tarrace
, terras
.] ☞ The Dutch trass is made by burning and grinding a soft grayish rock found on the lower Rhine.
Webster 1828 Edition
Trass
TRASS
n. A volcanic earth, resembling puzzolana, used as a cement; or a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water. The Dutch tarrass is made of a soft rock stone found near Collen, on the lower part of the Rhine. It is burnt like lime, and reduced to powder in mills. It is of a grayish color.Definition 2024
trass
trass
English
Alternative forms
Noun
trass (countable and uncountable, plural trasses)
- (geology) A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement.
- A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.