IPA: /ˈlɪpˌɡlɔs/
KK: /lɪpɡlɔs/
A cosmetic product applied to the lips to add color, shine, or moisture.
She applied a layer of lipgloss before heading out to the party.
Lipgloss → The word is formed from "lip" (from Old English "lippa", meaning the edge of the mouth) and "gloss" (from Greek "glōssa", meaning tongue or language, but in this context refers to a shiny appearance). The term "lipgloss" describes a cosmetic product that adds shine to the lips.
Think of the 'edge of the mouth' ('lip') being made shiny ('gloss') — that's what lipgloss does, it makes your lips shiny.