Shellfish

Part of speech: noun

Pronunciation: /ˈʃɛl.fɪʃ/

Definitions

1. Aquatic animals with hard outer coverings, such as clams, oysters, crabs, and lobsters, that are commonly eaten as food
2. Aquatic creatures characterized by a protective exoskeleton or shell, including species like crustaceans and mollusks, often consumed as seafood delicacies
3. Marine animals possessing a hard outer layer, like lobsters and mussels, which are popular in culinary dishes and have significant nutritional value

Etymology: Shellfish is one of the plainer compounds in English: a shell joined to fish, with no metaphor or borrowing needed. The word has been in the language since Old English, when it appeared as "sċielfisċ", and the two parts meant exactly what they say. The compound was simply the everyday name for creatures that were fished for and had shells. Its meaning has stayed broader than its parts suggest. Although "shell" and "fish" both point to the animals, the category cuts across biology. Mussels and clams are molluscs, lobsters and crabs are crustaceans, and the two groups are not closely related, yet the word groups them together by the shell and the catch. Middle English later wrote it as "schellefyssch", a spelling that shows the word's gradual move toward its modern form.

Synonyms: mollusk, crustacean