strontium 90

noun

Definition of strontium 90

: a heavy radioactive isotope of strontium of mass number 90 that has a half-life of 29 years, that is present in nuclear waste and fallout, and that is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals

Examples of strontium 90 in a Sentence

Recent Examples on the Web The cows in pastures were eating grass that was [contaminated] by strontium 90. Michael Schulman, The New Yorker, 17 June 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'strontium 90.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of strontium 90

1952, in the meaning defined above

Learn More About strontium 90

Time Traveler for strontium 90

Time Traveler

The first known use of strontium 90 was in 1952

See more words from the same year

Dictionary Entries Near strontium 90

strontium

strontium 90

strontium carbonate

See More Nearby Entries 

Statistics for strontium 90

Cite this Entry

“Strontium 90.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/strontium%2090. Accessed 29 Jun. 2022.

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

More Definitions for strontium 90

strontium 90

noun

Medical Definition of strontium 90

: a heavy radioactive isotope of strontium having the mass number 90 that is present in the fallout from nuclear explosions and is hazardous because like calcium it can be assimilated in biological processes and deposited in the bones of human beings and animals

called also radiostrontium

WORD OF THE DAY

Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

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!