Terras

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Terras \Ter"ras\, n. (Min.)
     See {?rass}.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 [gcide]:



  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}.]
     [1913 Webster]
  
     Note: The Dutch trass is made by burning and grinding a soft
           grayish rock found on the lower Rhine.
           [1913 Webster]