An eyelash primer is a product that is used before applying mascara to make eyelashes look thicker, longer, and more defined. It helps to condition and protect the lashes while also enhancing the effect of mascara. Full definition
Tarte Eyelash Primer — for days when I want extremely huge lashes, I'll layer this on my lashes first. (glassofglam.com)
I love big lashes, so I recently purchased this clean ingredient eyelash primer to * hopefully * replace the drugstore version I love so much. (amybethcampbell.com)
I curled my eyelashes with an eyelash curler and I used a mascara / eyelash primer every time. (stillbeingmolly.com)