Plural of henbane; multiple plants of the henbane species or references to henbane collectively.
Regular plural formation from 'henbane,' adding '-s' to the base noun. The plural reflects instances or varieties of these poisonous plants.
Medieval apothecary records show that henbanes were kept in separate locked containers in pharmacies because even small overdoses could kill, yet the same poison in tiny amounts was considered medicine—the difference between poison and cure was literally a matter of grams.
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