plural noun
crus·​ta·​cea | \ ˌkrə-ˈstā-sh(ē-)ə How to pronounce crustacea (audio) \

Definition of crustacea

: arthropods that are crustaceans

Examples of crustacea in a Sentence

Recent Examples on the Web There’s primitive pleasure in devouring a complete crustacea, exoskeleton and all. Matt Wake |, al, 18 Aug. 2021

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

First Known Use of crustacea

1814, in the meaning defined above

History and Etymology for crustacea

New Latin, group name, from neuter plural of crustaceus

Learn More About crustacea

Time Traveler for crustacea

Time Traveler

The first known use of crustacea was in 1814

See more words from the same year

Dictionary Entries Near crustacea




See More Nearby Entries 

Statistics for crustacea

Cite this Entry

“Crustacea.” Dictionary, Merriam-Webster, Accessed 18 Jan. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for crustacea


noun plural
crus·​ta·​cea | \ ˌkrəs-ˈtā-sh(ē-)ə How to pronounce crustacea (audio) \

Medical Definition of crustacea

1 capitalized : a large class of mostly aquatic arthropods that have a chitinous or calcareous and chitinous exoskeleton, a pair of often much modified appendages on each segment, and two pairs of antennae and that include the lobsters, shrimps, crabs, wood lice, water fleas, and barnacles
2 : arthropods of the class Crustacea

Other Words from crustacea

crustacean \ -​shən How to pronounce crustacea (audio) \ adjective or noun


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!