IPA: //ˈpaɪpəˌreɪzɪn//
KK: /ˈpaɪpəˌrezɪn/
A clear, colorless solid that is used in various medical and industrial applications, including as a treatment for certain parasitic infections and as a hardener in some types of plastics.
Piperazine is often used in veterinary medicine to treat worm infections in animals.
Piperazine is formed from "piper" (from Latin *piper*, meaning pepper) and "-azine" (a suffix used in chemistry to denote a class of compounds). The word refers to a chemical compound related to pepper, specifically in its structure and properties.
Think of 'pepper' ('piper') as a spice, and remember that 'piperazine' is a chemical compound related to that spice.