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countable and uncountable, plural henbanes
A poisonous plant, Hyoscyamus niger, used sometimes as a drug that causes at least hallucinations, dilated pupils, restlessness, and flushed skin. quotations examples
Deadly nightshade, henbane, hellebore and mandrakes were of evil reputation[.]
1936, Rollo Ahmed, The Black Art, London: Long, page 157
Any other plant of the genus Hyoscyamus. examples