: any of an order or suborder (Blattodea synonym Blattaria) of chiefly nocturnal insects including some that are domestic pests compare german cockroach

Examples of cockroach in a Sentence

Recent Examples on the Web
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After her death, investigators found the girl's asthma equipment in the home and stated it was not properly maintained and that a respiratory mask was found with cockroaches, the DA said. — Jose Fabian, CBS News, 14 Oct. 2026 At the hospital, an insect fell from the girl’s shoe, and a staffer saw a cockroach crawling on her, the district attorney’s office said. — Los Angeles Times, 14 Oct. 2026 Three live cockroaches were on boxes of to-go bags behind the counter. — Arkansas Online, 12 Oct. 2026 The contraption resembled a giant mechanical cockroach with claws at the tips of its antennae. — Ben Taub, New Yorker, 12 Oct. 2026 See All Example Sentences for cockroach

Word History

Etymology

by folk etymology from Spanish cucaracha cockroach

First Known Use

1616, in the meaning defined above

Time Traveler
The first known use of cockroach was in 1616

Cite this Entry

“Cockroach.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cockroach. Accessed 16 Oct. 2026.

Kids Definition

cockroach

noun
: any of an order of quick-moving insects that have long antennae and leathery forewings, are mainly nocturnal, and include pests of human dwellings

Medical Definition

: any of an order or suborder (Blattodea synonym Blattaria) of chiefly nocturnal insects including some that are domestic pests see blatta, blattella, periplaneta

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