Definition

1. Adjective:
   • Similar to, containing, or dissolved in water: Describes something that has the nature of water, is made with water, or has a substance mixed into water to form a solution.
   • Produced by the action of water: Describes something, especially in geology, that is formed by the action or processes involving water.

Usage

• The primary use of "aqueous" is as a scientific and technical adjective, most commonly in chemistry, biology, and geology.
• It is used to describe solutions where water is the solvent.
• It describes rocks or geological formations created by water-related processes.

Examples

• Chemistry/Biology:
  • The chemical reaction must take place in an aqueous environment.
  • Salt dissolves easily in an aqueous solution.
• Geology:
  • The canyon was formed by aqueous erosion over millions of years.
  • Sedimentary rocks like sandstone are often aqueous deposits.

Advanced Usage

• "Aqueous humor": A clear, watery fluid in the eye between the cornea and the lens.
  • Glaucoma can be caused by increased pressure from the aqueous humor.
• Describing non-water liquids that have water-like properties in specific contexts (e.g., in planetary science).
  • Scientists speculate about aqueous ammonia solutions existing on other planets.

Variants and Related Words

• Aqueousness (n, rare): The state or quality of being aqueous.
• Subaqueous (adj): Existing, formed, or taking place under water.
  • Subaqueous volcanoes create unique ecosystems.

Synonyms

• Watery: Resembling or consisting of water.
• Hydrous: Containing water, especially water of crystallization or hydration (more specific chemical term).

Antonyms

• Anhydrous: Containing no water, especially water of crystallization.
• Non-aqueous: Not involving or made with water (e.g., a like ethanol).

Related Phrases/Compounds

• Aqueous solution: The most common compound term, meaning a solution in which the solvent is water.
  • An aqueous solution of sodium chloride is simply saltwater.
• Aqueous phase: In chemistry, the water-based layer in a mixture of immiscible liquids.
  • In the separation funnel, the organic phase floated above the aqueous phase.

Adjective

1. produced by the action of water
2. similar to or containing or dissolved in water
   • aqueous solutions