Vilambichai  is a term from traditional Indian medicine, particularly in the context of Ayurveda, and it refers to Delayed Menstruation or Irregular Menstrual Cycles. The term "Vilambichai" (விலம்பிச்சை in Tamil) is often used in Tamil medicine and other South Indian medicinal practices to describe conditions where a woman's menstrual cycle is delayed or irregular.

In Ayurveda, the concept of delayed menstruation (or vilambichai) is usually connected to an imbalance in the body's doshas (Vata, Pitta, and Kapha) and could indicate an underlying health issue that needs to be addressed. It's important to note that while the term is widely understood in South Indian medicinal practices, its treatment and understanding may vary based on the individual's specific health condition and constitution.