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What is thavaikachchu in english?

The species Dioscorea bulbifera L. is known by the common name Thavaikachchu in Tamil.

Dioscorea bulbifera L.

Dioscorea bulbifera, called air potato or potato yam, is a member of the yam family grown for its tubers below ground and edible bulbils above. While both the tubers and bulbils are used medicinally, only the bulbils are generally edible. Some varieties produce a bitter-tasting tuber which becomes palatable after sustained boiling.

In English, Thavaikachchu (Dioscorea bulbifera L.) is known by Aerial yam, Air potato, Bulb-bearing yam, Bulbil-bearing yam, or Potato yam.

The world is like that: one gives a melon, the other gets the stomach cramps.
—Turkish proverb