Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

Medical Dictionary

carrier

play
noun car·ri·er \ˈkar-ē-ər\

Medical Definition of carrier

  1. 1a:  a person, animal, or plant that harbors and transmits the causative agent of an infectious disease; especially :  one who carries the causative agent systemically but is asymptomatic or immune to it <a carrier of typhoid fever>—compare reservoir 2, vector 2b:  an individual possessing a specified gene and capable of transmitting it to offspring but not expressing or only weakly expressing its phenotype; especially :  one that is heterozygous for a recessive factor

  2. 2:  a usually inactive substance used in association with an active substance especially for aiding in the application of the active substance: asa:  a support for a catalystb:  a vehicle serving especially as a diluent (as for an insecticide or a drug)

  3. 3:  a substance (as a catalyst) by whose agency some element or group is transferred from one compound to another





Seen and Heard

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

WORD OF THE DAY

to defraud especially of money

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

prompt maudlin oily angry
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