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.

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

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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