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# crustacean

noun (a crustacean, crustaceans); adjective (crustacean)

«crustacean» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

A crustacean is an animal with a hard outer shell, jointed legs and no backbone, which usually lives in water, such as a crab, lobster, shrimp, prawn or crayfish. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#m1)

### In the lessons

In science lessons on animal groups, crustaceans are invertebrates and arthropods, like insects and spiders; woodlice are crustaceans that live on land. They grow by shedding their shell (moulting). In food safety some people are allergic to crustaceans (shellfish). Phrases: crustaceans such as crabs, a shellfish allergy.

### Examples

- A crab is a crustacean. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x1)
- Lobsters, shrimps and prawns are all crustaceans. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x2)
- Woodlice are crustaceans that live on land. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x3)
- A crustacean has a hard shell and jointed legs. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x4)
- Crustaceans grow by shedding their old shells. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x5)
- We found small crustaceans in the rock pool. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x6)
- Some people are allergic to crustaceans. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/#x7)

### Note

Countable: a crustacean, crustaceans. Pronounced krus-TAY-shun. Trap: woodlice are not insects; they are crustaceans. Shellfish include both crustaceans and molluscs (like mussels).

## On Mova

- [Trees and pragmatics of «crustacean» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/crustacean/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«crustacean» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/crustacean.html) on Mova free.