There are 3 main definitions of mercury in English:

mercury1

Syllabification: mer·cu·ry
Pronunciation: /ˈmərkyərē
 
/

noun

1The chemical element of atomic number 80, a heavy silvery-white metal that is liquid at ordinary temperatures. (Symbol: Hg) Also called quicksilver.
More example sentences
  • The wetlands dense foliage has the ability to handle heavy metals, like mercury, zinc, nickel and copper.
  • For example, tobacco plants can absorb heavy metals, mercury, copper, and lead.
  • Combined with silver, mercury, copper and antimony, however, gold is to be found finely distributed.
1.1The column of mercury in a thermometer or barometer, or its height as indicating atmospheric temperature or pressure: the mercury rises, the skies steam, and the nights swelter
More example sentences
  • A type of blood pressure monitor that uses a column of mercury to measure cuff pressure.
  • This is because the traditional blood pressure monitor - known as a sphygmomanometer - uses a column of mercury to measure pressure.
  • Heat merges with the steady beat of the waves, sending testosterone and adrenaline levels rising like mercury in a thermometer.
1.2 historical Mercury or one of its compounds used medicinally, especially to treat syphilis.
More example sentences
  • Shakespeare was probably being treated with mercury for syphilis, it seems.
  • In the late 15th century, the famous alchemist Paracelsus began to prescribe mercury to treat syphilis.
  • Many people know about the former use of mercury in treating syphilis, for the substance had some benefit and the remedy endured for centuries.

Origin

Middle English: from Latin Mercurius ( see Mercury (sense 1)).

Definition of mercury in:

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There are 3 main definitions of mercury in English:

mercury2

Syllabification: mer·cu·ry
Pronunciation: /ˈmərkyərē
 
/

noun

A plant of the spurge family.

Origin

mid 16th century: from Latin mercurialis 'of the god Mercury'.

Definition of mercury in:

There are 3 main definitions of mercury in English:

Mercury3

Syllabification: Mer·cu·ry
Pronunciation: /ˈmərkyərē
 
/
1 Roman Mythology The Roman god of eloquence, skill, trading, and thieving, herald and messenger of the gods, who was identified with Hermes.
[from Latin Mercurius, from merx, merc- 'merchandise']
1.1Used in names of newspapers and journals: the San Jose Mercury News
More example sentences
  • His mother, Doreen, has spoken out in the local Mercury newspaper about the spate of attacks.
  • A Wollongong specialist told the Mercury he had been told of two false positive readings.
  • Did his will request The Mercury's editor try to force him out early?
2 Astronomy A small planet that is the closest to the sun in the solar system, sometimes visible to the naked eye just after sunset.

Mercury orbits within the orbit of Venus at an average distance of 36 million miles (57.9 million km) from the sun. With a diameter of 3,031 miles (4,878 km), it is only a third larger than earth’s moon, which it resembles in having a heavily cratered surface. Its ‘day’ (equivalent to 58.65 Earth days) is precisely two thirds the length of its ‘year’ (87.97 Earth days). Daytime temperatures average 338°F (170°C). There is no atmosphere and the planet has no satellites

3A series of space missions, launched by the US from 1958 to 1963, that achieved the first US manned space flights.

Derivatives

Mercurian

Pronunciation: /mərˈkyo͝orēən/
adjective
More example sentences
  • But this is a particularly auspicious week to re-introduce some lightweight, playful, frivolous fun and frolics into the Mercurian milieu.
  • If the universe hasn't lavished you with extravagance lately, use this week's Mercurian energy to add some major extensions to your wish list.
  • The youngster's Mercurian friends have singled him out: even in dismal Dublin he is unique.

Definition of mercury in: