trass

noun
\ˈtras\
variants: or less commonly terrace or tarras \təˈras \
plural trasses also terraces or tarrases

Definition of trass 

: a light-colored volcanic tuff resembling pozzolana in composition and occurring especially on the lower Rhine where it is ground for use in a hydraulic cement

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History and Etymology for trass

Dutch trass, terras, from French terrasse pile of earth, terrace, from Middle French

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