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.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI