Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having, resembling, or constituting a hard crust or shell.
  • adj. Crustacean.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Resembling a crustacean.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, or of the nature of, crust or shell; having a crustlike shell.
  • adj. Belonging to the Crustacea; crustacean.

from The Century Dictionary and Cyclopedia

  • Pertaining to crust; like crust; of the nature of a crust or shell.
  • In zoology: Having a crust-like shell; belonging to the Crustacea; crustacean.
  • In entomology, having a somewhat hard and elastic texture, resisting slight pressure, but not rigid: said of parts of the integument.
  • In botany: Hard, thin, and brittle.
  • In lichenology, forming a flat crust in or upon the substratum, and adhering to it firmly by the whole under surface, so as not to be separable without injury: applied to the thallus of lichens.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. being or having or resembling a hard crust or shell
  • adj. of or belonging to the class Crustacea

Etymologies

Latin crūsta, shell; see kreus- in Indo-European roots + -aceous.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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