The first hint to crack the puzzle "This poisonous plant killed prisoners in old times" is:

It is a word which contains 7 letters

The second hint to crack the puzzle "This poisonous plant killed prisoners in old times" is:

It starts with letter h

The third hint to crack the puzzle "This poisonous plant killed prisoners in old times" is:

It ends with letter k

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The answer for the puzzle "This poisonous plant killed prisoners in old times" is: