eyeliner
n. C / U B1 Intermediate US //ˈaɪˌɫaɪnɝ// UK //ˈaɪlaɪnɐ// eye·lin·er
n. a type of makeup you put on the skin around your eyes. You use it to make your eyes look bigger or more noticeable.
n. a cosmetic substance applied to the rim of the eyelids to enhance or define the appearance of the eyes. Available in liquid, pencil, or gel forms.
She applies black eyeliner before she goes to the party.
The makeup artist used a waterproof eyeliner to ensure the look stayed perfect during the long wedding ceremony.
Modern cosmetic trends often involve bold eyeliner techniques, such as the winged look, which requires a steady hand and high-pigment liquid formulas.
From eye + liner.
Usage
Uncountable when referring to the substance in general; countable when referring to a specific pencil or product.