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Kids glossary

Words explained simply

419 words from maths, science, computers and English, each explained in a sentence or two. Pick a letter, or scroll down for all of them.

Words that start with S

40 words start with S. Show all words

S

Scalene triangle Maths
A triangle where all three sides are different lengths.
Scanner Computers
A machine that copies a picture or page from paper into a computer.
Screenshot Computers
A picture of what is on your screen.
Search engine Computers
A website that helps you find things on the internet, like Google or Bing.
Sector Maths
A slice of a circle, like a piece of pizza.
Sensor Computers
A part that notices something in the world, like light, heat or movement, and tells the computer.
Sentence English
A group of words that makes complete sense. It starts with a capital letter and ends with a full stop, question mark or exclamation mark.
Sequence Computers
Steps done in a certain order, one after the other.
Server Computers
A powerful computer that stores websites and files and sends them to other computers.
Setting English
Where and when a story takes place.
Simile English
A comparison using "like" or "as", such as "as brave as a lion".
Singular English
Just one. "Book" is singular.
Skeleton Science
The frame of bones that holds up the body and protects its organs.
Software Computers
Programs and apps that tell a computer what to do. You cannot touch software.
Soil Science
The top layer of the ground where plants grow, made of tiny bits of rock and rotted plants.
Solar system Science
The Sun and everything that goes round it, including the eight planets.
Solid Science
A state of matter that keeps its own shape, like a stone.
Solution Science
A liquid with something dissolved in it, like salt in water.
Sound Science
Something we hear, made when things vibrate and send waves through the air.
Source English
A person, book or website where you get information.
Spam Computers
Unwanted messages, often adverts, sent to many people.
Speed Science
How fast something is moving, such as 60 kilometres in one hour.
Spelling English
The correct order of letters in a word.
Sphere Maths
A perfectly round solid shape, like a ball.
Sprite Computers
A character or object that you can move and control in a program like Scratch.
Square Maths
A shape with four equal sides and four right angles.
Square number Maths
The answer when you multiply a number by itself. 5 x 5 = 25, so 25 is a square number.
Square root Maths
The number that makes a square number when multiplied by itself. The square root of 49 is 7.
Stanza English
A group of lines in a poem, like a paragraph in a story.
Star Science
A huge ball of hot, glowing gas that gives out light, like our Sun.
Storage Computers
The place where a computer keeps files for a long time.
Straight angle Maths
An angle of exactly 180 degrees, which makes a straight line.
Subject English
The part of a sentence that tells who or what the sentence is about.
Subtraction Maths
Taking one number away from another to find what is left. The sign is -.
Suffix English
Letters added to the end of a word to change its meaning, like "ful" in "helpful".
Sum Maths
The total you get when you add numbers together.
Summary English
A short retelling of the main points of something.
Syllable English
A beat in a word. "Elephant" has three syllables: el-e-phant.
Symmetry Maths
When one half of a shape is an exact mirror picture of the other half.
Synonym English
A word that means nearly the same as another word. "Big" and "large" are synonyms.

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