Ferocity n. : Savage wildness or fierceness; fury; cruelty; as, ferocity of countenance.

Example:
How is the size and Ferocity of a volcanic explosion measured?

Taxonomy
ferocity, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, Custom Search, glossary, english, language, ESL, Search, roc, ty, rä, state of being, Unabridged Dictionary, Open Dictionary.

Defination from the web:
ferocity from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "ferocity" with Google Search >> Custom Search. Learn more about "ferocity" and related topics at Britannica.com ...