LD50

noun
\ ˌel-ˌdē-ˈfif-tē How to pronounce LD{inf}50{/inf} (audio) \

Definition of LD50

: the amount of a toxic agent (such as a poison, virus, or radiation) that is sufficient to kill 50 percent of a population of animals usually within a certain time

First Known Use of LD50

1942, in the meaning defined above

History and Etymology for LD50

lethal dose

Keep scrolling for more

Learn More about LD50

Dictionary Entries near LD50

LCT

ld

LD

LD50

LDC

ldg

LDH

See More Nearby Entries 

Statistics for LD50

Cite this Entry

“LD50.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/LD50. Accessed 15 May. 2021.

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

Keep scrolling for more

More Definitions for LD50

LD50

noun
variants: or LD50 \ ˈel-​ˈdē-​ˈfif-​tē How to pronounce LD50 (audio) \

Medical Definition of LD50

: the amount of a toxic agent (as a poison, virus, or radiation) that is sufficient to kill 50 percent of a population of animals usually within a certain time

called also median lethal dose

Comments on LD50

What made you want to look up LD50? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Words Used by Nabokov Quiz

  • image1676440788
  • Choose the best definition or synonym for the word in bold: "There are some eructations that sound like cheers—at least, mine did." Lolita
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

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!