1926, in the meaning defined above
International Scientific Vocabulary
Time Traveler for isoelectronic
See more words from the same year
Cite this Entry
“Isoelectronic.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isoelectronic. Accessed 3 Dec. 2021.
See Definitions and Examples »
Get Word of the Day daily email!
Difficult Spelling Words Quiz
Test your knowledge - and maybe learn something along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Top 10 Latin Phrases
Don't argue with the dictionary
This is usage
A simple trick to keep them separate
How 'literally' can mean "figuratively"
How to use a word that (literally) drives some pe...
The awkward case of 'his or her'
How many do you know?
Take the quiz
Test your knowledge - and maybe learn something a...