How to Say "toxic substance" in Spanish
The Spanish word for “toxic substance” is “tóxico” — C1 level.
English → SpanishC1
nounC1formal
legal or medical context

Examples
El cuerpo trata de eliminar los tóxicos a través del hígado.
The body tries to eliminate toxins through the liver.
Plural Form
To talk about more than one, simply add -s: 'los tóxicos'.
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