From Hindupedia, the Hindu Encyclopedia
By Swami Harshanada
Svadhā or Svadhādevī was one of the daughters of Dakṣaprajāpati. She had been married to the seven pitṛs or manes:
The food that is offered to them in śrāddhas should be accompanied by the mantra ‘svadhā’. Then only they can get the same. Obviously this is a symbolical concept. When the mantra ‘svadhā’ is uttered while offering the piṇḍas, it will induce the necessary power into them so as to be received by the pitṛs.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore