Hellfire (noun)

1. The fire believed to burn in hell, as a punishment for the damned.
2. Intense burning heat and light, often used as a metaphor for intense anger or passion.

Origin:

The word "hellfire" is derived from the middle english word "hellefire" which is a combination of the word "hell" and "fire", the word "hell" is from the old english word "hel" which refers to the underworld, the abode of the dead and the word "fire" refers to intense burning heat and light.

Examples:

1. He warned them of the hellfire that awaited them if they did not repent.
2. He spoke with hellfire in his eyes.
3. The building was consumed by hellfire.