om·​ni·​cide | \ ˈäm-ni-ˌsīd How to pronounce omnicide (audio) \
plural omnicides

Definition of omnicide

: the destruction of all life or all human life (as by nuclear war) As our understanding grows, so does the horror. What we face now is not merely slaughter or genocide, but "omnicide," the obliteration of all humans and all living species.— Penney Kome and Patrick Crean Would any-one be inclined to argue that omnicide is in the national interest, is patriotic or is economically profitable? Surely, these questions answer themselves.— John Somerville

Other Words from omnicide

omnicidal \ ˌäm-​ni-​ˈsī-​dᵊl How to pronounce omnicide (audio) \ adjective
Yet the continuation of the human species can no longer be taken for granted. It has been endangered since the onset of the omnicidal weapons first demonstrated in 1945 in Hiroshima and Nagasaki. The destruction of these cities heralded a new age, the nuclear age, the chief characteristic of which is that for the first time it has become possible for man to destroy his own species in a single action. — Joseph Rotblat

First Known Use of omnicide

1959, in the meaning defined above

History and Etymology for omnicide

omni- + -cide

Learn More About omnicide

Time Traveler for omnicide

Time Traveler

The first known use of omnicide was in 1959

See more words from the same year

Dictionary Entries Near omnicide

omnibus box



See More Nearby Entries 

Statistics for omnicide

Cite this Entry

“Omnicide.” Dictionary, Merriam-Webster, Accessed 29 May. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Great Words for Scrabble

  • scrabble tiles that read scrabble quiz
  • Which of the following Q-without-U words means the number five in cards or dice?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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