How to Say "eyelash" in Spanish
The Spanish word for “eyelash” is “pestaña” — A2 level. This is a very common word in everyday Spanish.

Examples
Ella tiene las pestañas muy largas y rizadas.
She has very long and curly eyelashes.
Me entró una pestaña en el ojo y me molesta mucho.
An eyelash got in my eye and it's really bothering me.
Cierra los ojos para que te ponga el rímel en las pestañas.
Close your eyes so I can put mascara on your eyelashes.
Always Feminine
The word 'pestaña' is always feminine, so you must use 'la' or 'las' with it, regardless of whose eyelashes they are.
Using the Singular
While we usually talk about eyelashes in the plural ('las pestañas'), we use the singular ('la pestaña') when referring to just one hair that fell out or got stuck.
Eyelashes vs. Eyebrows
Mistake: “Me duelen las pestañas (when referring to the hair above the eye).”
Correction: Use 'cejas' for eyebrows and 'pestañas' for the hairs on your eyelids.
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