Rydberg constant

variants: or Rydberg unit

Definition of Rydberg constant

: a wave number characteristic of the atomic spectrum of each element equal to the constant factor in the wave-number formula for all the spectral series of the elements and having a value from 109,678 cm−1 for hydrogen to 109,737 cm−1 for the heaviest elements

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 Rydberg constant

1900, in the meaning defined above

History and Etymology for Rydberg constant

after Johannes R. Rydberg

Keep scrolling for more

Learn More About Rydberg constant

Time Traveler for Rydberg constant

Time Traveler

The first known use of Rydberg constant was in 1900

See more words from the same year

Dictionary Entries Near Rydberg constant


Rydberg constant


See More Nearby Entries 

Statistics for Rydberg constant

Cite this Entry

“Rydberg constant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Rydberg%20constant. Accessed 24 Sep. 2021.

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


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

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