sco·ri·a (skôr-, skr-)
n. pl. sco·ri·ae (skôr-, skr-)
1. Geology Porous cinderlike fragments of dark lava. Also called cinders, slag.
2. Metallurgy The refuse of a smelted metal or ore; slag. Also called cinder.
[Middle English, dross, from Latin scria, from Greek skri, from skr, excrement, dung; see sker-3 in Indo-European roots.]
scori·aceous (-shs) adj.
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The American Heritage® Dictionary of the English Language.
Kristin loves to snow ski, and she knows that she should ski in snow deep enough so that her skis do not toss up scoria.