What term describes a material that can cause illness or injury if inhaled, swallowed, or absorbed?

The correct term for a material that can cause illness or injury if inhaled, swallowed, or absorbed is "toxic substance." Toxic substances are known for their potential to cause harm to living organisms, often affecting bodily functions or leading to serious health issues, depending on the level of exposure and the nature of the substance. The term encompasses a wide range of chemicals and biological agents that can produce harmful effects, and understanding this classification is crucial for ensuring safety in environments where exposure to such materials is possible.

In contrast to toxic substances, corrosive substances can cause damage to living tissue or materials upon contact but do not inherently cause harm through inhalation, ingestion, or absorption unless they are also toxic. Harmful substances might cause adverse effects but don't necessarily have a systematic or severe toxicity like a toxic substance would. Flammable substances are focused on their ignition properties and ability to catch fire, which is a different concern compared to the health risks posed by toxic substances.