Definition

1. Adjective:
   • Having a hard shell: Describes animals or plants that possess a hard, protective outer covering. This shell is typically rigid and serves as a defense against predators or environmental damage.

Usage

• The term "hard-shelled" is used attributively, meaning it typically comes before a noun to describe it. It is a compound adjective formed from "hard" and "shelled."
• It is most commonly applied to animals like certain turtles, crabs, mollusks, and nuts or seeds from plants.

Examples

• Adjective:
  • The beach was littered with hard-shelled clams.
  • Tortoises are hard-shelled reptiles.
  • He collected hard-shelled nuts like walnuts and pecans.

Advanced Usage

• Scientific/Technical Context: In biology and paleontology, "hard-shelled" is a standard descriptor for organisms with exoskeletons or protective calcareous, chitinous, or bony coverings.
  • The fossil record shows an explosion of hard-shelled marine life during the Cambrian period.

Variants and Related Words

• Hard-shell (adjective): Sometimes used interchangeably with "hard-shelled," especially in informal contexts or as a modifier (e.g., a hard-shell case). Note: "Hard-shell" can also figuratively describe a person who is rigid or uncompromising in their beliefs.
• Shelled (adjective): Having a shell. "Hard-shelled" specifies the type of shell.
• Exoskeleton (noun): The external skeleton that supports and protects an animal's body, typical of many hard-shelled arthropods.

Synonyms

• Armored: Covered with or protected by a hard layer, often used for animals.
• Testaceous: Having a hard shell, especially a shell like that of a mollusk. (More technical/scientific)
• Crustaceous: Resembling or having a crust or hard shell. (Technical, often for crustaceans)

Antonyms

• Soft-shelled: Having a soft or flexible shell.
• Shell-less: Lacking a shell entirely.

Related Phrases/Compounds

• Hard-shelled crab: A crab with a fully hardened exoskeleton, as opposed to a soft-shell crab.
• Hard-shelled egg: An egg with a calcified, rigid shell, like those of birds and many reptiles.
• Hard-shelled case: A protective container with a rigid exterior (note: this applies the concept to objects, not biology).

Adjective

1. of animals or plants that have a hard shell