Castor seeds are seeds from the Castor Bean Plants. ..Ricinus communis is the Botanical name. The oil extract has medicinal properties and are also used for making hair oils. We as kids were given a dose of castor oil once in two months to clean our digestive system.Yuck ! It used to be a harrowing experience as the oil tasted horrible!! I wonder if any one uses the oil for this purpose now !The oil can be slightly warmed and massaged on the feet before going to bed to prevent cramps.
There is one Kitchen use for this. Yes.. two seeds ground with the rice and lentil soaked for making iddlis will make the softest and fluffiest iddlis:)