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Definition of igneous:

  1. Pertaining to, having the nature of, fire; containing fire; resembling fire; as, an igneous appearance.
  2. Resulting from, or produced by, the action of fire; as, lavas and basalt are igneous rocks.

Synonyms:

pyrogenous, feldspar, basalt, fiery, ardent, chalk, pyrogenic, torrid, impassioned, flaming, hematite, flint, crystal, volcanic, fervent, perfervid, hot, pyrogenetic, felspar, molten, haematite, fervid, eruptive, alabaster.

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