Sty (noun)

1. A small pen or enclosure for swine.
2. An infection of the eyelid caused by a blocked gland, characterized by redness, swelling, and the presence of pus.
3. A dirty or messy place.

Origin:

Middle english sti, from old english stīg.

Examples:

1. The pig was kept in a sty.
2. The woman had a sty on her eyelid and it was swollen and red.
3. The room was a sty and it was in need of cleaning.
4. I woke up with a sty on my eyelid and had to go to the doctor.
5. The barn was a sty and it was filled with dirt and debris.