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The Collaborative International Dictionary
Trass

Trass \Trass\, n. [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.]

Note: The Dutch trass is made by burning and grinding a soft grayish rock found on the lower Rhine.

Wiktionary
trass

n. 1 (context geology English) A white to grey volcanic tufa, formed of decomposed trachytic cinders, sometimes used as a cement. 2 A coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water.

Wikipedia
Trass

Trass is the local name of a volcanic tuff occurring in the Eifel, where it is worked for hydraulic mortar. It is a grey or cream-coloured fragmental rock, largely composed of pumiceous dust, and may be regarded as a trachytic tuff. It much resembles the Italian pozzolana and is applied to like purposes. Mixed with lime and sand, or with Portland cement, it is extensively employed for hydraulic work, especially in the Netherlands; while the compact varieties have been used as a building material and as a fire-stone in ovens. Trass was formerly worked extensively in the Brohl valley and is now obtained from the valley of the Nette, near Andernach.

Usage examples of "trass".

He strode out of the room with Trass, leaving Hutyer alone with Paula Bernard.

He looked around him, and saw Trass and Paula, floating amongst the debris that had been torn from the ship.

As Trass lurched to one side, uttering a startled cry, Hutyer leapt forward and grabbed his arm.

He hung on for grim death as the reptilian creature tried to tug Trass into the water.

For a second Trass balanced on the edge of the boat, then, with a cry of despair he was pulled over, into the surging waters beneath the raft.

With those words he snapped up his pole and a good-sized trass flew green and silver through the air.

Now as he spoke a trass took that opportunity to snatch the bait and run with the line, propelling Lester upright.

Eventually a muddy, bloody-handed Lester broke out of the brush and all but shoved the big-mouthed trass in his face.

Kathy Jon reached down beside the bed and lifted up a large, ugly, stiff trass with opened mouth.

Everybody had been in love with Lina Trass, Alec said, Lyndon among the rest.

All the same, Lina Trass had better have married Dan Liss, who never in his life bounced man, woman, or child, than an ill-conditioned braggart like Sabine.

She will trass up your figures and admonitions, and present them to me in a more palatable form, I trust.

E per fare che questo non avvenisse, da sei volte, anzi che di su il letticel si movessero, ve 'l rimisero, tanto che per quella volta gli trasser sì la superbia del capo, che egli si stette volentieri in pace.