[pot-urb, -hurb]
any herb prepared as food by cooking in a pot, as spinach, or added as seasoning in cookery, as thyme.

1530–40; pot1 + herb

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World English Dictionary
potherb (ˈpɒtˌhɜːb)
any plant having leaves, flowers, stems, etc, that are used in cooking for seasoning and flavouring or are eaten as a vegetable

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Later, the leaves may be boiled in salted water and served with butter or lemon
  juice as a potherb.
Wild mustard is another famous potherb, preferred by many people for cooking
  with fat salt pork.
Related species have served as an emergency potherb.
The basal leaves can also be used as a potherb, but may be bitter in taste.
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