A is a human-made or human-introduced poison that can injure or kill living organisms . While the terms "toxin" and "toxicant" are often used interchangeably, they have distinct scientific definitions: toxicants are synthetic or artificial substances (like pesticides), whereas toxins are naturally produced by living organisms (like snake venom or bacterial waste). 🧪 Key Differences: Toxicant vs. Toxin Definition of toxicant - NCI Dictionary of Cancer Terms