Webster's English Dictionary

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scoria

sco.ria \'sko-r-e--*, 'sko.r-\ \-e--.e-, -e--.i-\ \.sko-r-e--'a--sh*s, 
   .sko.r-\ n or sco.ri.ae [ME, fr. L, fr. Gk sko-ria, fr. sko-r excrement - 
   more at (] plMSCAT- 1: the refuse from melting of metals or reduction of 
   ores : SLAG  2: rough vesicular cindery lava  - sco.ri.a.ceous aj