One of the mysteries of the English language finally explained.
A light-colored variety of volcanic ash resembling pozzolana, used in making water-resistant cement.
- ‘Although usually of lead, in Deptford the cooler was made of tarras, a cement which, like lead, did not dissolve in the acidic solution.’
Late 18th century: from Dutch tras, German Trass, based on Latin terra ‘earth’.
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