plas·​tin | \ ˈplastə̇n\
plural -s

Definition of plastin

1 : an acidophilic component of protoplasm more or less coextensive with the presumed highly polymerized protein framework of cytoplasm and nucleus
2 : the substance of the true nucleolus

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!

History and Etymology for plastin

International Scientific Vocabulary plast- (from Greek plastos) + -in; probably originally formed in German

Keep scrolling for more

Learn More about plastin

Statistics for plastin

Look-up Popularity

Comments on plastin

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


the perfect form or example of something

Get Word of the Day daily email!

Test Your Vocabulary

What did you just call me?! A Quiz

  • rows-of-various-emoji
  • If a member of the audience describes your speech as bombastic, does that person mean it is:
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Add Diction

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

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