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# octopus

«octopus» in Mova's school dictionary: **A sea animal with a soft, round body and eight long arms…** — its meaning for a pupil, its sense in the lessons and examples, with 5 sentences of Mova's corpora that use it.

### part of speech

noun (an octopus, octopuses / octopi)

### meaning for a pupil

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

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

### In the corpora

- [An octopus really has three hearts; some surprising facts are true.](https://md.mova.elamur.ai/free/en/corpora/school/ai/7-pretend-games-quotes-and-two-bots/8/)
- [A squid has 8 arms and 2 longer tentacles, and like an octopus it has 3 hearts.](https://md.mova.elamur.ai/free/en/corpora/school/biology/8-the-ocean/17/)
- [The octopus's body heart stops while it swims, so swimming tires it quickly, and octopuses mostly crawl over the rocks instead.](https://md.mova.elamur.ai/free/en/corpora/school/biology/39-octopuses-squid-and-cuttlefish/6/)
- [Octopuses can solve puzzles, open jars, learn by watching and remember people; wild ones carry coconut shell halves to hide in.](https://md.mova.elamur.ai/free/en/corpora/school/biology/39-octopuses-squid-and-cuttlefish/9/)
- [An octopus has eight arms with suckers all along them, and scientists call them arms, not tentacles.](https://md.mova.elamur.ai/free/en/corpora/school/biology/40-counting-legs-arms-wings-and-tails/7/)

### Trees and pragmatics

[Every meaning and example of «octopus» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/O/octopus/), each sentence with its dependency tree and frames.