01 a. Of or pertaining to or suitable for the lower regions, inhabited, according to the ancients, by the dead; pertaining to Pluto's realm of th…
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1.
Of or pertaining to or suitable for the lower regions, inhabited, according to the ancients, by the dead; pertaining to Pluto's realm of the dead, the Tartarus of the ancients.“The Elysian fields, the infernal monarchy.” — Garth.
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2.
Of or pertaining to, resembling, or inhabiting, hell; suitable for hell, or to the character of the inhabitants of hell; hellish; diabolical; as, infernal spirits, or conduct.“The instruments or abettors in such infernal dealings.” — Addison.
Phrases & compounds
Infernal machine —
a machine or apparatus maliciously designed to explode, and destroy life or property.
Infernal stone —
(lapis infernalis), lunar caustic; formerly so called. The name was also applied to caustic potash.