megaseism

noun

mega·​seism

ˈmegəˌsīzəm sometimes -sez- or -sāz- or -sēz-

: a violent earthquake

megaseismic

¦⸗⸗¦sī|zmik also |sm- sometimes -¦se| or -¦sā| or -¦sē|

adjective

Word History

Etymology

International Scientific Vocabulary mega- + seism

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now