infest

[in-fest]

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verb (used with object)

to live in or overrun to an unwanted degree or in a troublesome manner, especially as predatory animals or vermin do: Sharks infested the coastline.

to be numerous in, as anything undesirable or troublesome: the cares that infest the day.

Archaic. to harass.

Origin of infest

1375–1425; late Middle English < Latin infestāre to assail, molest, derivative of infestus hostile

Related formsin·fest·er, nounre·in·fest, verb (used with object)un·in·fest·ed, adjective

Can be confusedinfect infest invest

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for infest

pollute, defile, overwhelm, beset, assail, flock, worry, fill, crowd, pester, ravage, swarm, invade, teem, infect, plague, abound, press, penetrate, crawl

Examples from the Web for infest

Historical Examples of infest

It extinguishes every dirty spark of malice and envy, which are but too apt to infest me.
The Letters of Robert Burns
Robert Burns
Insects do not seem to infest it as they do the ostreatus and the sapidus.
The Mushroom, Edible and Otherwise
M. E. Hard
They infest desert places, and are nocturnal in their habits.
History of Religion
Allan Menzies
From them have come the many species of shark that now infest our ocean.
Unwritten Literature of Hawaii
Nathaniel Bright Emerson
Other species eat most of the scales which infest fruit and forest trees.
Checking the Waste
Mary Huston Gregory

British Dictionary definitions for infest

infest

verb (tr)

to inhabit or overrun in dangerously or unpleasantly large numbers

(of parasites such as lice) to invade and live on or in (a host)

Derived Formsinfestation, nouninfester, noun

Word Origin for infest

C15: from Latin infestāre to molest, from infestus hostile

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for infest

late 15c., "to attack, assail, hurt, distress, annoy," from Middle French infester, from Latin infestare "to attack, disturb, trouble," from infestus "hostile, dangerous," originally "inexorable, not able to be handled," from in- "not, opposite of" (see in- (1)) + -festus "(able to be) seized." Sense of "swarm over in large numbers" first recorded c.1600. Related: Infested; infesting.

infest in Medicine

infest

[ĭn-fĕst′]

v.

To live as a parasite in or on tissues or organs or on the skin and its appendages.

To inhabit or overrun in numbers large enough to be harmful, threatening, or obnoxious.

Related formsin′fes•ta′tion n.