opium has definitions from the field of pharmacology
1
[ noun ] (pharmacology) an addictive narcotic extracted from seed capsules of the opium poppy

Used in print

(Mignon G. Eberhart, The Cup, the Blade...)

She was deeply , horribly sure that Lucien had filled it with opium .

Now wait a minute , she told herself , think_about it ; Lucien is not the only person in this house who could have put opium in that coffee .

She had lost a bottle of opium - but that was on the trip from New_Orleans .

It would have been easy to identify as opium by its odor .

It was not very reasonable to believe that Lucien had procured unprocurable opium and come_back to Honotassa with a formed plan to murder her .

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