猪圈 (zhū juàn) literally combines 猪 (zhū), meaning 'pig', and 圈 (juàn), meaning 'enclosure' or 'pen'. Together, it refers specifically to a fenced or enclosed area—often simple or rustic—where pigs are kept, fed, and raised. It emphasizes function over structure: a pigsty may be made of wood, bamboo, brick, or even mud, and is commonly found on rural farms or smallholdings in China.

The word carries a neutral descriptive tone in agricultural contexts but can occasionally imply messiness or rustic simplicity when used metaphorically (e.g., describing a very untidy room). Unlike more formal terms like 养猪场 (yǎng zhū chǎng, 'pig farm'), 猪圈 refers to a basic, often family-scale enclosure—not a commercial facility. It appears frequently in farming discussions, folk tales, idioms (e.g., 猪圈里飞不出金凤凰), and rural literature.