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trass

trass


  1  definition  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  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}.] 
 
  Note:  The  Dutch  trass  is  made  by  burning  and  grinding  a  soft 
  grayish  rock  found  on  the  lower  Rhine.