Description
Nandukkal generally refers to fossil crab (நண்டுக்கல்), which is a primary ingredient in a traditional Siddha medicine called Nandukkal Parpam. This medicine is widely used for treating urinary and kidney disorders, such as kidney stones and urinary tract infections.
“Nandukal” (or nandu) is a name for crab in several Indian languages, primarily in the South.
Here are some common names for crab in various Indian languages:
- Tamil: நண்டு (Nandu)
- Malayalam: ഞണ്ട് (Njandu) or ഞണ്ടുകള് (Njandukal – plural)
- Other names found in literature: Kalavan, kuliram, nalli, kavaiththal, karkkadaham, and alavan.
The term nandukal is also historically significant in the Siddha system of medicine in India, where “nandukkal” (fossil crab stone) has been used in traditional remedies for various ailments, including urinary stones and skin disorders.







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