Noah Webster's New International Dictionary of the English Language

1. (a.) Pertaining to hell; diabolical; as, infernal spirits, or conduct; suitable for hell, or to the character of the inhabitants of hell; hellish.

2. (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 the dead, the Tartarus of the ancients.

3. (n.) An inhabitant of the infernal regions; also, the place itself.