Definition

1. Noun:
   • A chemical element: A ductile, silvery-white, ferromagnetic, trivalent metallic element of the rare earth group, with the symbol Gd and atomic number 64. This is the element gadolinium.
   • A nerve agent: A lethal chemical weapon that is easily absorbed into the body and acts as a cholinesterase inhibitor; highly toxic when inhaled. This is a type of organophosphate nerve agent.

Usage Examples

• Noun (Element):

  • Gd is used as a contrast agent in magnetic resonance imaging (MRI).
  • The alloy contained a small amount of Gd to improve its magnetic properties.

• Noun (Nerve Agent):

  • The treaty prohibits the production and stockpiling of GD.
  • Exposure to even a small amount of GD can be fatal.

Advanced Usage

• Scientific Context: In chemistry and materials science, 'Gd' almost exclusively refers to the element gadolinium. Its properties are often discussed in technical literature.
  • The Gd ions were doped into the crystal lattice.
• Military/Defense Context: In discussions of chemical warfare, 'GD' refers to the nerve agent (also known as soman).
  • Protective gear is essential when handling GD.

Variants and Related Words

• Gadolinium (n): The full name for the chemical element Gd.
• Soman (n): An alternative name for the GD nerve agent.

Synonyms

• For the element: Gadolinium (full name).
• For the nerve agent: Soman; nerve gas; organophosphate agent.

Important Notes

• Capitalization: The chemical element symbol 'Gd' is always written with a capital 'G' and lowercase 'd'. In the context of the nerve agent, it is often written in all capitals as 'GD' to distinguish it, though this is not a strict rule.
• Context is Critical: The meaning of 'gd' is entirely dependent on context. In a medical or physics paper, it means the element. In a military or disarmament document, it likely means the nerve agent. The two meanings are unrelated.
• Avoiding Ambiguity: To prevent confusion, it is standard practice to use the full terms "gadolinium" or "soman" instead of the abbreviation 'Gd/GD' unless the context is explicitly clear.

Noun

1. a ductile silvery-white ductile ferromagnetic trivalent metallic element of the rare earth group
2. a nerve agent easily absorbed into the body; a lethal cholinesterase inhibitor that is highly toxic when inhaled