This is the 13000th most frequent Spanish word.
pestaña
Eyelash or browser tab.
In this sentence, 'pestaña' refers to the physical eyelash, a body part.
La pestaña de mi ojo es muy larga.
The eyelash of my eye is very long.
Here, 'pestaña' is used metaphorically to refer to a browser tab in software.
Abrí una nueva pestaña en el navegador de mi computadora.
I opened a new tab in my computer's browser.
In this context, 'pestaña' describes a physical label or tab on a file folder.