[kruh-stey-shuh s]


of the nature of or pertaining to a crust or shell.
having a hard covering or crust.

Origin of crustaceous

First recorded in 1640–50, crustaceous is from the New Latin word crūstāceus (adj.) hard-shelled. See crustacean, -aceous
Related formsnon·crus·ta·ceous, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for crustaceous

Historical Examples of crustaceous

  • The groups of crustaceous organisms classed as Entomostraca.

    The Sailor's Word-Book

    William Henry Smyth

  • The shell is kidney-shaped, and of a leathery, crustaceous substance.

  • It seems to tell of a hardness—bad propensities—a crustaceous nature.


    Alexander Walker

  • The crabs are pulled out with a celerity that astonishes their crustaceous lordships.

  • Are we not told that the horse in the crustaceous age—I select a large word at random—was built no bigger than a dog?

    Hints to Pilgrims

    Charles Stephen Brooks

British Dictionary definitions for crustaceous



forming, resembling, or possessing a surrounding crust or shell
zoology another word for crustacean (def. 2)
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