Noah Webster
Infernal
INFERN'AL, adjective [Latin infernus.]
1. Properly, pertaining to the lower regions, or regions of the dead, the Tartarus of the ancients. Hence,
2. Pertaining to hell; inhabiting hell; as infernal spirits.
3. Hellish; resembling the temper of infernal spirits; malicious; diabolical; very wicked and detestable.
INFERN'AL, noun An inhabitant of hell, or of the lower regions.
Infernal stone [Lapis infernalis.] a name formerly given to lunar caustic, a substance prepared from an evaporated solution of silver, or from crystals of silver.
Lunar caustic is nitrate of silver fused and cast in small cylinders.