Merriam-Webster Logo
SINCE 1828
Menu
×

isomerism

noun isom·er·ism \ ī-ˈsä-mə-ˌri-zəm \

Definition of isomerism

1 : the relationship of two or more chemical species that are isomers
2 : the relation of two or more nuclides with the same mass numbers and atomic numbers but different energy states and rates of radioactive decay

First Known Use of isomerism

1838

in the meaning defined at sense 1

See Words from the same year
NEW! Time Traveler

Medical Dictionary

isomerism

noun isom·er·ism \ ī-ˈsäm-ə-ˌriz-əm \

medical Definition of isomerism

1 : the relation of two or more chemical species that are isomers
2 : the relation of two or more nuclides with the same mass numbers and atomic numbers but different energy states and rates of radioactive decay

Learn More about isomerism

  1. Britannica.com: Encyclopedia article about isomerism

Seen and Heard

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

show hide

Love words? Need even more definitions?

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

WORD OF THE DAY

skirl

play

to emit the high shrill tone of bagpipes

Get Word of the Day daily email!

TRENDING NOW

  1. asylum 'protection from arrest and extradition given especially to political refugees'

  2. insubordinate 'disobedient to authority'

  3. promulgate 'to make known by open declaration'

  4. epochal 'momentous or unparalleled'

  5. clemency 'merciful treatment of someone who could be given harsh punishment'

SEE ALL

BROWSE DICTIONARY

isomerism

Test Your Vocabulary

Words for Summer: A Quiz

  • a-closeup-of-a-sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?

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