scoria

[skawr-ee-uh, skohr-]
noun, plural scoriae [skawr-ee-ee, skohr-] .
1.
Metallurgy. the refuse, dross, or slag left after melting or smelting metal; scum.
2.
Geology. a cinderlike basic cellular lava.

Origin:
1350–1400; Middle English < Latin scōria < Greek skōría, derivative of skôr dung

scoriaceous [skawr-ee-ey-shuhs, skohr-] , adjective
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World English Dictionary
scoria (ˈskɔːrɪə)
 
n , pl -riae
1.  a rough cindery crust on top of solidified lava flows containing numerous vesicles
2.  refuse obtained from smelted ore; slag
 
[C17: from Latin: dross, from Greek skōria, from skōr excrement]
 
scoriaceous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
scoria   (skôr'ē-ə)  Pronunciation Key 
Plural scoriae (skôr'ē-ē')
Rough, crusty, solidified lava containing numerous vesicles that originated as gas bubbles in the lava while it was still molten.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Although clinker commonly is called scoria, scoria is not the appropriate term.
Both scoria and pumice develop their bubbly textures when escaping gas is
  trapped as lava solidifies.
Most are composed of central scoria and tuff cones intruded by numerous dikes
  and one or more plugs.
Scoria and lava deposits overlie tuff deposits from early eruptions.
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