1937, in the meaning defined above
isotopic number
isotopic spin
isotretinoin
“Isotopic spin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isotopic%20spin. Accessed 15 Dec. 2024.
Britannica.com: Encyclopedia article about isotopic spin
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
See Definitions and Examples »
Get Word of the Day daily email!
Share