Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

macroseism

noun
mac·​ro·​seism | \ ˈmakrōˌsīzəm sometimes -sez- or -sāz- or -sēz-\

Definition of macroseism

: a severe or major earthquake — compare microseism

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Other Words from macroseism

macroseismic \ ¦makrō¦sī|zmik also |sm-​ sometimes -​¦se| or -​¦sā| or -​¦sē| \ adjective

History and Etymology for macroseism

International Scientific Vocabulary macr- + -seism

Keep scrolling for more

Learn More about macroseism

Statistics for macroseism

Look-up Popularity

Comments on macroseism

What made you want to look up macroseism? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

nonpareil

Listen to the pronounciation of nonpareil

having no equal

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games