trassn.
/trɑːs/, /tras/, U.S. /træs/ = tarras n.
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the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > volcanic rocks > other volcanics
tarras1612
greystone1781
trass1794
rhyolite1861
nephelinite1863
metavolcanic1942
1793 J. Smeaton Narr. Edystone Lighthouse (ed. 2) §201 Tarras. [Note] This substance, when prepared for use, is by the Dutch called Tras, from which our appellation of Tarras undoubtedly originates.]
1794 R. Kirwan Elements Mineral. (ed. 2) I. 354 Often mistaken for volcanic traass.
1811 J. Pinkerton Petralogy II. 427 The trass of the environs of Andernach, on the left bank of the Rhine, is a kind of puzzolana formed of small fragments of pumice, and several species of lavas... Trass is transported by water as far as Dort, to be reduced to powder in stamping mills worked by the wind... The Dutch also supply England with trass.
1838 Civil Engineer & Architect's Jrnl. 1 412/2 Tarras, or trass, is a bluish black cellular trap or lava, quarried at Andernach on the Rhine, into millstones.
1862 G. P. Scrope Volcanos (ed. 2) 178 Both puzzolana and trass, when mixed up with lime, set readily under water.
This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2022).
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