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Prefix · electricity / electronic

electro-

Signals relation to electricity: electricity, electrode, electrocardiogram, electrolyte.

Scientific

Written by Bryan López, English teacher · Updated October 2026

What does the prefix electro- mean?

Electro- comes from the Greek elektron, which means "amber". The ancients discovered that rubbing amber produced static electricity, and the name stuck. Today the prefix shows a relation to electricity and electrical phenomena.

Electro- in modern technology

Electro- is one of the most productive prefixes in technology: it appears in devices, in studies of the human body, in batteries and in the science of circuits. It also gave its name to a music genre. If you see electro- in a word, the common thread is electricity.

How it is used

Attaches to scientific and technical nouns:

electro- + phenomenon/field
lysis → electrolysisdynamics → electrodynamicschemistry → electrochemistrymagnetic → electromagnetic
electro- + device/signal
de → electrodecardiogram → electrocardiogramencephalogram → electroencephalogramlyte → electrolyte

Pronunciation: /ɪˈlektrəʊ/. "Electro" alone also refers to an electronic music genre.

How it is pronounced

electro-/ɪˈlektrəʊ/

Tap the button to hear how the prefix sounds. Each word in the table has its own audio.

Examples

Root word

With electro-

In a phrase

icityelectricityThe town lost electricity for three days during the storm.
deelectrodeThe scientist attached electrodes to the scalp to measure brain activity.
lysiselectrolysisElectrolysis uses electric current to remove hair permanently.
magneticelectromagneticLight, radio waves, and X-rays are all types of electromagnetic radiation.
cardiogramelectrocardiogramThe doctor ordered an electrocardiogram to check for heart irregularities.
lyteelectrolyteShe drank a sports drink to replace the electrolytes lost while running.
nicselectronicsThe electronics factory produces millions of circuit boards each year.

Common mistakes

electrolyte = just a sports drink

electrolyte = any substance that conducts electricity in solution; sports drinks replace the ones lost from the body

"Electrolyte" is a scientific term: any substance that dissociates into ions in solution and conducts electricity (sodium, potassium, chloride in the body; sulfuric acid in lead batteries). Sports drinks replenish the electrolytes lost in sweat.

electromagnet = a powerful permanent magnet

electromagnet = a temporary magnet created by electric current that loses its magnetism when the current stops

An electromagnet is only magnetic while current flows through its coil. Cut the power and the magnetism disappears. Permanent magnets (like fridge magnets) maintain their magnetism without electricity.

A trick to remember it

Think of electricity running through a wire: electro- = electricity. electrode, electrocardiogram.

Practise what you learned

Exercise 1 · Form the word

Exercise 2 · Pick the right one

"___ are minerals in blood and body fluids that carry an electric charge and are vital for muscle function."

Exercise 3 · Pick the right one

What is an electromagnet?

Frequently asked questions

What does the prefix electro- mean in English?

The prefix electro- signals relation to electricity: electricity, electrode, electrocardiogram, electrolyte.

How do you pronounce electro-?

The prefix electro- is pronounced /ɪˈlektrəʊ/. For example, "electricity".

Can you give an example of a word with electro-?

"icity" becomes "electricity". It is a typical example of the electro- prefix.

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