IPA: /ɪˈnʌŋkʃən/
KK: /ɪˈnʌŋkʃən/
The act of applying oil or ointment to the skin, often for medicinal or ceremonial purposes.
The doctor recommended an inunction to help soothe the rash on my arm.
Inunction is formed from "in-" (meaning into) and "unctio" (from "ungere", meaning to anoint). The word refers to the act of applying a substance, typically for medicinal purposes, into the skin or body.
Think of 'anointing' something 'into' the skin — that's what inunction means.