GD

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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

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