ry·​an·​o·​dine | \ rīˈanəˌdēn, -də̇n \
plural -s

Definition of ryanodine

: a crystalline insecticidal alkaloid C25H35NO9 that is toxic to mammals and is obtained from the root and stem of the ryania

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 ryanodine

1948, in the meaning defined above

History and Etymology for ryanodine

irregular from New Latin Ryania (genus name of Ryania speciosa) + English -ine

Keep scrolling for more

Learn More about ryanodine

Time Traveler for ryanodine

Time Traveler

The first known use of ryanodine was in 1948

See more words from the same year

Statistics for ryanodine

Cite this Entry

“Ryanodine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ryanodine. Accessed 15 Apr. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Comments on ryanodine

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


Test Your Vocabulary

The Exceptions Quiz III

  • one green toy robot amidst many red toy robots
  • Which of these words does not mean "nonsense"?
True or False

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


Anagram puzzles meet word search.

Love words? Need even more definitions?

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