1. Plural of mercury; the liquid metallic element (Hg) used in thermometers, barometers, and other instruments.
Usage: scientific/technical
2. Plural of Mercury; the Roman god of commerce, eloquence, and theft, typically depicted with winged sandals and a caduceus.
Usage: mythology; capitalized in singular form
3. Plural of Mercury; the smallest planet in the solar system and the one closest to the Sun.
Usage: astronomy; capitalized in singular form

Examples

• Old thermometers contained mercuries that could be dangerous if the glass broke.
• The ancient Romans worshipped mercuries and other deities in their temples.
• Astronomers study the surfaces of mercuries and other inner planets.
• Mercury is the only metal that is liquid at room temperature; mercuries in scientific equipment must be handled carefully.
• In classical art, mercuries are often shown carrying a staff called a caduceus.