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# octopus

noun (an octopus, octopuses / octopi)

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

## Everyday

A sea animal with a soft, round body and eight long arms covered in suckers. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#m1)

### In the lessons

In science: octopuses are molluscs without a shell; they are very clever, can change colour and shape to hide (camouflage), squirt ink to escape, and have three hearts and blue blood. In maths: «octo» means eight, like an octagon. Phrases: «octopus arms/tentacles», «octopus ink».

### Examples

- An octopus has eight arms. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x1)
- The octopus squirted ink and swam away. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x2)
- Octopuses can change colour to hide. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x3)
- We saw an octopus at the aquarium. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x4)
- An octopus has three hearts. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x5)
- The octopus squeezed through a tiny hole. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x6)
- Octo means eight, so an octopus has eight arms and an octagon has eight sides. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/#x7)

### Note

«An octopus». Plural: octopuses is the most common; octopi is also used but less correct (the word is Greek, not Latin); octopodes is rare. Scientists call the arms «arms», not «tentacles».

## On Mova

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