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 13 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

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
True or False

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

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

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!