IPA: //ˈstreɪtənər//
KK: /ˈstreɪtənər/
A tool used to make hair straight by applying heat, typically consisting of two metal plates that are heated and pressed together.
She used a straightener to smooth her curly hair before the party.
Straightener → It is formed from "straight" (from Old English *streht*, meaning extended or direct) and "-ener" (a suffix indicating a person or thing that performs a specific action). The word "straightener" refers to a device or person that makes something straight or corrects its direction.
Think of something that makes things 'extended' or 'direct' — that's what a straightener does, it helps to correct or align.