Definition

Noun: 1. A highly toxic, white, powdered compound: Arsenic trioxide is a chemical compound consisting of arsenic and oxygen. It is a white, odorless powder that is poisonous and was historically used in various industrial and agricultural applications.

Examples of Usage

• Noun:
  • The laboratory stored the arsenic trioxide in a securely locked cabinet due to its extreme toxicity.
  • Historically, arsenic trioxide was a common ingredient in rat poisons and herbicides.
  • The chemical formula for arsenic trioxide is As₂O₃.

Advanced Usage

• In medicine: In modern, highly controlled medical contexts, arsenic trioxide is used as a chemotherapeutic agent for treating a specific type of leukemia (acute promyelocytic leukemia). This is a specialized therapeutic application under strict medical supervision, contrasting with its historical use as a poison.
  • Example: The oncologist prescribed a course of arsenic trioxide as part of the targeted therapy.

Variants and Related Words

• Arsenic (noun): The chemical element (As) from which arsenic trioxide is derived. Arsenic itself is a metalloid known for its toxicity.
• White arsenic (noun): A common historical name for arsenic trioxide, referring to its typical powdered form.
• Arsenous oxide (noun): An alternative chemical name for arsenic trioxide.

Synonyms

• White arsenic
• Arsenous oxide
• Ratsbane (archaic term, specifically when used as a rodenticide)

Notes on Meaning and Usage

• Primary Connotation: The term overwhelmingly carries connotations of deadly poison. Its historical uses in pesticides and its presence in crime novels have cemented this association.
• Context is Critical: The meaning is almost entirely dependent on context. In a historical or toxicology text, it refers to a poison. In a modern medical oncology context, it refers to a specific, regulated pharmaceutical.
• Caution in Use: This term should be used with precision and awareness of its serious implications. It is not a term for casual conversation.

Noun

1. a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer