IPA: /ɪnˈtɒk.sɪ.kənt/
KK: /ɪnˈtɑk.sɪ.kənt/
A substance that causes a person to become intoxicated, particularly alcoholic drinks.
Many people enjoy a glass of wine as an intoxicant during dinner.
Intoxicant is formed from "in-" (meaning into) and "toxicum" (from Latin, meaning poison). The word refers to a substance that brings one into a state of poisoning or intoxication.
Think of something that brings you 'into' ('in-') a state of 'poisoning' ('toxicum') — that's why an intoxicant is a substance that causes intoxication.