IPA: //ˈlækrɪˌmeɪtə//
KK: /lækˈrɪmətər/
A substance that causes tears to be produced, often used in situations like crowd control or self-defense.
The police used a lacrimator to disperse the crowd during the protest.
Lacrimator → It is formed from "lacrima" (meaning tear) and "-tor" (meaning one who). The word refers to one who causes tears, often used in the context of substances that induce crying, such as tear gas.
Think of someone or something that causes 'tears' ('lacrima') — that's why a 'lacrimator' is something that makes you cry.