crayfish
Americannoun
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crayfish,
plural
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crayfishes
plural
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Also called crawdad, crawdaddy. any freshwater decapod crustacean of the genera Astacus and Cambarus, closely related to but smaller than the lobsters.
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any of several similar marine crustaceans, especially the spiny lobster.
noun
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any freshwater decapod crustacean of the genera Astacus and Cambarus, resembling a small lobster
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any of various similar crustaceans, esp the spiny lobster
Usage
What does crayfish mean? A crayfish is a freshwater crustacean related to the lobster but smaller. Crayfish is also used as the name of several similar saltwater crustaceans, especially the spiny lobster (also called the rock lobster). The plural of crayfish can be crayfish or crayfishes. When used as a plural, crayfish typically refers to them collectively, while crayfishes usually refers to two or more kinds or species (but this isn’t always the case). Crayfish aren’t fish—they’re shellfish. Other types of crustaceans include crabs, lobsters, and shrimp. There are several different species of both freshwater and saltwater crayfish. Freshwater ones are also referred to by the names crawfish, crawdad, and crawdaddy. Use of these terms varies by region. Example: When I was a kid, we used to catch crayfish in the creek.
Other Word Forms
Noun Inflected Forms
Etymology
Origin of crayfish
1350–1400; alteration (by folk etymology) of Middle English crevis < Middle French crevice < Old High German krebiz crab 1
Compare meaning
How does crayfish compare to similar and commonly confused words? Explore the most common comparisons:
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Environmental specialist Peter Cunningham told AFP that potential sediment plumes could impact rocky shoreline habitats, crayfish spawning and breeding species.
From Barron's ● Aug. 25, 2026
We see Adrian at the film’s beginning as a small child, catching crayfish and other underwater creatures.
From The Wall Street Journal ● Jul. 9, 2026
The River Lugg is home to six protected and endangered species, including common otter, Atlantic salmon, white clawed crayfish, brook lamprey, shad and bullhead.
From BBC ● May 26, 2026
Conservation scientists and those who coordinate invasive species control efforts have different aims, but both need one thing: to know where their target crayfish are.
From Science Daily ● Nov. 25, 2024
The stew that was served at lunch had too much crayfish; Kainene would not have liked it and she would have leaned toward him and said so.
From "Half of a Yellow Sun" by Chimamanda Ngozi Adichie
Farther east a gap occurs in the distribution and no crayfishes are met with till the basin of the Amur is reached, where a group of species occurs, extending into northern Japan.
From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" by Various
Name three in which they differ.How are crayfishes caught for market?
From A Guide for the Study of Animals by Frederic Lucas
I afterward visited the locality several times, collecting specimens of the mounds and crayfishes, which are now in the United States National Museum, and making observations.
From Scientific American Supplement, No. 446, July 19, 1884 by Various
Their warfare on crayfishes must not be overlooked, nor must we forget the more personal debt of gratitude we owe them for preying upon mosquitoes.
From Our Vanishing Wild Life Its Extermination and Preservation by William Temple Hornaday
Ulenspiegel, wishing to know why he was mimicking the crayfishes in this fashion, planting himself before him and smiling, jumped in step with him.
From The Legend of Ulenspiegel, Volume I (of 2) And Lamme Goedzak, and their Adventures Heroical, Joyous and Glorious in the Land of Flanders and Elsewhere by Charles Th?odore Henri de Coster
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
