Meaning of the word expander in English

What does expander mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

expander

US /ɪkˈspændər/
UK /ɪkˈspændər/

Noun

a device or substance used to increase the size or volume of something

Example:
The dentist used an oral expander to widen the patient's palate.
A chest expander is a common piece of exercise equipment.