H and D speed

\ ¦āchənˈdē- \

Definition of H and D speed

: a number indicating the sensitivity of a photographic emulsion determined by the method of Hurter and Driffield

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 H and D speed

after Ferdinand Hurter and Charles Driffield fl 1890

Learn More About H and D speed

Dictionary Entries Near H and D speed

hand drum

H and D speed

H and D system

See More Nearby Entries 

Statistics for H and D speed

Cite this Entry

“H and D speed.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/H%20and%20D%20speed. Accessed 28 Jan. 2022.

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


Test Your Vocabulary

Name that Thing: Flower Edition

True or False

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

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!