A vein that is shaped like an "S" and is typically located in the human body.

"घुमावदार शिरा"

English Usage: The sigmoid vein plays a crucial role in the circulatory system.

Hindi Usage: घुमावदार शिरा परिसंचरण तंत्र में महत्वपूर्ण भूमिका निभाती है।