• synonyms


[skawr-ee-uh, skohr-]
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noun, plural sco·ri·ae [skawr-ee-ee, skohr-] /ˈskɔr iˌi, ˈskoʊr-/.
  1. Metallurgy. the refuse, dross, or slag left after melting or smelting metal; scum.
  2. Geology. a cinderlike basic cellular lava.
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Origin of scoria

1350–1400; Middle English < Latin scōria < Greek skōría, derivative of skôr dung
Related formssco·ri·a·ceous [skawr-ee-ey-shuh s, skohr-] /ˌskɔr iˈeɪ ʃəs, ˌskoʊr-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for scoriae

Historical Examples

  • They are at a depth of about 12 ft., in slaty shale containing Llandeilo fossils and contemporaneous felspathic ash and scoriae.

    Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3


  • In some instances the cones are quite intact, and the beds of ash and scoriae are as yet almost unaffected by denuding agencies.

  • The solid matter thrown out by volcanoes consists of lapilli, scoriae, dust and bombs.

  • Along these fissures, in a few days, scoriae cones appeared; on one occasion no less than thirty-six in number.

  • After the scoriae have been skimmed off, the upper and purer portion of the mass is refined, and the lower part re-melted.

British Dictionary definitions for scoriae


noun plural -riae (-rɪˌiː)
  1. a rough cindery crust on top of solidified lava flows containing numerous vesicles
  2. refuse obtained from smelted ore; slag
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Derived Formsscoriaceous (ˌskɔːrɪˈeɪʃəs), adjective

Word Origin

C17: from Latin: dross, from Greek skōria, from skōr excrement
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

scoriae in Science


Plural scoriae (skôrē-ē′)
  1. Rough, crusty, solidified lava containing numerous vesicles that originated as gas bubbles in the lava while it was still molten.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.