Definition, Meaning & Synonyms
exo
Prefix
/ˈɛk.səʊ/

Definition
A prefix meaning ‘outside’ or ‘external’.

Examples
- Exoplanet: A planet located outside our solar system.
- Exoskeleton: An external skeleton that supports and protects an animal’s body.
- Exothermic: A chemical reaction that releases energy in the form of heat.

Meaning
Used in scientific terms to denote something that is external or originates from outside a certain area or structure.

Synonyms
- Exterior
- External
- Outer