IPA: /ˌɛθɪˈlɛnɪk/
KK: /ɛˈθɪlɪnɪk/
Relating to or having the characteristics of ethylene, a colorless gas used in the production of various chemicals and plastics.
The ethylenic compounds are essential in the manufacturing of many synthetic materials.
Ethylenic → It is formed from "ethylene" (from Greek "aithylenos", meaning a compound derived from ethylene) and the suffix "-ic" (meaning pertaining to). The word "ethylenic" refers to something that is related to or derived from ethylene, a type of hydrocarbon.
Think of 'ethylene' as the base compound, and remember that 'ethylenic' means something that pertains to or is derived from ethylene.