cinder

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cinder

1. any solid waste from smelting or refining
2. fragments of volcanic lava; scoriae

cinder

[′sin·dər]
(geology)
Fine-grained pyroclastic material ranging in diameter from 0.16 to 1.28 inch (4 to 32 millimeters).
(materials)
Slag from a metal furnace.
(metallurgy)
Scale cast off in forging metal.