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

infest

play
verb in·fest \in-ˈfest\

Simple Definition of infest

  • of something harmful or unwanted : to be in or over (a place, an animal, etc.) in large numbers

Full Definition of infest

  1. transitive verb
  2. 1 :  to spread or swarm in or over in a troublesome manner <a slum infested with crime> <shark-infested waters>

  3. 2 :  to live in or on as a parasite

in·fes·tant play \-ˈfes-tənt\ noun
in·fes·ta·tion play \ˌin-ˌfes-ˈtā-shən\ noun
in·fest·er play \in-ˈfes-tər\ noun

Examples of infest

  1. <in desperation, we called in an exterminator because the house was infested with ants>



Origin of infest

French infester, from Latin infestare, from infestus hostile


First Known Use: 1602


INFEST Defined for Kids

infest

play
verb in·fest \in-ˈfest\

Definition of infest

in·fest·edin·fest·ing

  1. :  to spread or swarm in or over in a harmful manner <Termites infested the tree.>




Medical Dictionary

infest

play
transitive verb in·fest \in-ˈfest\

Medical Definition of infest

  1. :  to live in or on as a parasite <the flea that infests cats> <horses infested with worms>—compare infect





Seen and Heard

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

WORD OF THE DAY

February 13, 2016

a trying or distressing experience

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image33683556

How much does a batman (the Turkish unit of measurement) weigh?

196.5 pounds 16.96 pounds 2.2 pounds 100 pounds
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ