substance the real physical matter of which a person or thing consists; "DNA is the substance of our genes"
atropine a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides
hyoscyamine a poisonous crystalline alkaloid (isometric with atropine but more potent); used to treat excess motility of the gastrointestinal tract
poison -
anything that harms or destroys; "the poison of fascism"
modify,
alter,
change make less severe or harsh or extreme; "please modify this letter to make it more polite"; "he modified his views on same-gender marriage"
poison -
spoil as if by poison; "poison someone's mind"; "poison the atmosphere in the office"
Poisons are substances that can cause disturbances to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism. Legally and in hazardous chemical labeling, poisons are especially toxic substances; less toxic substances are labeled "harmful", "irritant", or not labeled at all. In medicine (particularly veterinary) and in zoology, a poison is often distinguished from a toxin and a venom.
OmegaWiki Dictionary
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poison A substance which, when ingested, inhaled, or absorbed, or when applied to, injected into, or developed within the body, in relatively small amounts, may cause injury, harm, or destruction to organs, tissue, or life.