LD50

noun \ˌel-ˌdē-ˈfif-tē\

Definition of LD50

  1. :  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

Origin and Etymology of ld50

lethal dose


First Known Use: 1942


Medical Dictionary

LD50

noun

Medical Definition of LD50

  1. :  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

Variants of ld50

or

LD50

\ˈel-ˈdē-ˈfif-tē\play

Seen and Heard

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

a Mesopotamian temple tower

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • alphabet-magnets
  • Which is the correct spelling?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ