IPA: /ˈlaɪtənər/
KK: /ˈlaɪtənər/
A substance or tool that makes something lighter in color or weight.
She used a hair lightener to achieve a brighter shade.
Lightener → It is formed from "light" (from Old English *leoht*, meaning not heavy or bright) and "-en" (a suffix used to form verbs or adjectives indicating to make or become). The word "lightener" means to make something lighter or brighter.
Think of 'light' as something that is not heavy or bright, and the '-en' means to make. So, a lightener is something that makes things lighter or brighter.