Webster
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Webster’s Revised Unabridged Dictionary · 1913

Trass

Trass (trăs), 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.]

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

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.