Definition

Noun: 1. A chemical compound: Potassium bromide is a white, crystalline, water-soluble salt with the chemical formula KBr. 2. A sedative medication: Historically, it was used in medicine as a central nervous system depressant to treat conditions like epilepsy and anxiety. 3. A photographic chemical: It is used in the photographic process, particularly in the production of photographic emulsions and as a restrainer in photographic developers.

Usage Examples

• As a chemical compound:
  • Potassium bromide is commonly used in laboratory settings as an infrared spectroscopic window.
• As a historical medication:
  • In the 19th century, doctors prescribed potassium bromide to calm hysterical patients.
• In photography:
  • Adding potassium bromide to the developer helps prevent fogging on the film.

Advanced Usage

• "Bromide" as a common noun: The term "bromide" can refer to any chemical compound containing a bromide ion or, figuratively, to a trite or unoriginal statement. However, "potassium bromide" specifically refers to the KBr salt.
  • While "bromide" can be a cliché, "potassium bromide" is a specific chemical.

Variants and Related Words

• Bromide (n): A general term for a compound containing bromine, or a sedative drug, or a platitude.
• Potassium (n): A soft, silver-white metallic element (symbol K), which is a component of this salt.
• Bromine (n): A dark red-brown nonmetallic liquid element (symbol Br), which is the other component of this salt.

Synonyms

• KBr (Chemical formula)
• Sedative salt (Historical/functional description)

Notes on Meaning

• The primary modern meaning relates to its use as a chemical reagent in scientific and industrial applications.
• Its historical use as an anticonvulsant and sedative is now largely obsolete due to the development of safer drugs.
• Its role in traditional photographic development remains a technical, specialized meaning.

Noun

1. a white crystalline salt (KBr) used as a sedative and in photography