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pupil
Definition
The pupil is the black circle in the centre of your eye. It is the opening through which light enters your eye.
The pupil gets bigger when it is dark and smaller when it is bright. This is because the pupil controls the amount of light that enters your eye. When it is dark, you need more light to see, so the pupil gets bigger. When it is bright, you need less light to see, so the pupil gets smaller.
The size of the pupil is controlled by muscles in the iris. The iris is the coloured part of your eye. The muscles in the iris can make the pupil bigger or smaller by changing the shape of the iris.
The pupil is an important part of your eye. It helps you to see in different light conditions.
How can the word be used?
The pupil of the eye controls the amount of light that enters the eye.
Different forms of the word
Noun: the dark opening in the centre of the iris of the eye.
Etymology
The word "pupil" comes from the Latin word "pupilla", which means "little doll".
The first recorded use of the word "pupil" in English was in the 14th century.
Question
What happens to your pupil in a light room?