The Portuguese word for eyelash is
cílio

Gender

The gender of cílio is masculine. E.g. o cílio.

The plural of cílio is cílios.

eyelash
1. cílio, pestana

cílio
1. n-m. eyelash

pestana
1. n-f. eyelash (one of the hairs which grow along the edge of eyelids)
2. n-f. nap (short period of sleep)
3. n-f. (musical instrument) nut (a small piece at the peghead end of the fingerboard of string instruments that holds the strings)
4. n-f. (music) barre chord (type of chord where a finger presses multiple strings)