Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

adion

noun
ad·​ion | \ ˈa-ˌdī-ən also -ˌän\
plural -s

Definition of adion

: an ion adsorbed on a surface

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

First Known Use of adion

1932, in the meaning defined above

History and Etymology for adion

adsorbed ion

Keep scrolling for more

Learn More about adion

Statistics for adion

Look-up Popularity

Time Traveler for adion

The first known use of adion was in 1932

See more words from the same year

Comments on adion

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

Show Comments  Hide Comments 

WORD OF THE DAY

remittance

Listen to the pronounciation of remittance

a sum of money that is sent as a payment

Get Word of the Day daily email!

Test Your Vocabulary

Time Traveler Quiz: Which Word Came First?

  • time traveler quiz which word came first
  • Which came first?
True or False

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

TAKE THE QUIZ
Word Winder's CrossWinder

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