infest

verb in·fest \ in-ˈfest \
Updated on: 20 Nov 2017

Definition of infest

transitive verb
1 : to spread or swarm in or over in a troublesome manner
  • a slum infested with crime
  • shark-infested waters
2 : to live in or on as a parasite

infestant

play \in-ˈfe-stənt\ noun

infestation

play \ˌin-ˌfe-ˈstā-shən\ noun

infester

play \in-ˈfe-stər\ noun

Examples of infest in a Sentence

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

Recent Examples of infest from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'infest.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of infest

French infester, from Latin infestare, from infestus hostile

infest Synonyms


INFEST Defined for English Language Learners

infest

verb

Definition of infest for English Language Learners

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


INFEST Defined for Kids

infest

verb in·fest \ in-ˈfest \

Definition of infest for Students

infested; infesting
: to spread or swarm in or over in a harmful manner Termites infested the tree.

Medical Dictionary

infest

transitive verb in·fest \ in-ˈfest \

medical Definition of infest

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


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