IGNIP'OTENT, adjective [Latin ignis, fire, and potens, powerful.]

Presiding over fire. Vulcan is called the power ignipotent

IGNIS FATUUS, noun [Latin] A meteor or light that appears in the night, over marshy grounds, supposed to be occasioned by phosphoric matter extricated from putrefying animal or vegetable substances, or by some inflammable gas; vulgarly called - Will with the wisp, and Jack with a lantern.