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Webster 1913 Edition

Trass

Trass

,
Noun.
[D.
tras
or Gr.
trass
, probably fr. It.
terrazzo
terrace. See
Terrace
.]
(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.

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