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Mercury in Irish (Mearcair): Meaning, Pronunciation, Usage

The Irish for mercury is mearcair, a masculine noun (plural mearcairí).
Updated October 2026Report a mistake

How to say “mercury” in Irish

Irish:
mearcair
English:
mercury
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“MYAR-kir”  /ˈmʲaɾˠkəɾʲ/
Various forms
Plural:
mearcairí (mercuries)
Genitive singular:
mearcair, an mhearcair (e.g. nimhiú mearcair, mercury poisoning)
Genitive plural:
mearcairí, na mearcairí (e.g. comhdhúile na mearcairí, the compounds of the mercuries)

What does “mearcair” mean?

mercury
A heavy silver-coloured metal that is liquid at room temperature, used in old thermometers.Also: quicksilver, hg.

“Mearcair” with the article

The plural of mercury in Irish is mearcairí. Here is mearcair after the article (an t-alt), in the singular and the plural.

an mearcair
the mercury
No change after an
na mearcairí
the mercuries
Plural: no change after na

“Mearcair” in a sentence: Irish examples

Common Irish sentences using mearcair, the Irish word for mercury.

Is miotal leachtach é mearcair.
Mercury is a liquid metal.
Bhí mearcair sa teirmiméadar fadó.
There used to be mercury in the thermometer.
Tá an mearcair an-nimhiúil.
Mercury is very poisonous.
Thit leibhéal an mhearcair go tapa.
The level of the mercury dropped quickly.
Tá rian mearcair san iasc sin.
There is a trace of mercury in that fish.
Ná leag lámh ar an mearcair sin.
Don't touch that mercury.
D'fhoghlaimíomar faoi mhearcair sa rang ceimice.
We learned about mercury in chemistry class.

Other nouns in Irish

More everyday Irish nouns to learn next.

Mercury in Irish: frequently asked questions

What is the Irish for mercury?

The Irish for mercury is mearcair (pronounced “MYAR-kir”). It’s a masculine noun and the plural is mearcairí.

How do you pronounce mearcair in Irish?

Mearcair is said like “MYAR-kir” (IPA /ˈmʲaɾˠkəɾʲ/).

What is the plural of mercury in Irish?

The plural of mearcair is mearcairí; with the article, na mearcairí means “the mercuries”. The genitive plural is mearcairí, as in comhdhúile na mearcairí (the compounds of the mercuries).

Why does mearcair change to mhearcair?

After words like mo (my) and do (your) the first letter is lenited: mo mhearcair. After ár (our) it stays ár mearcair, because m does not take eclipsis.

Is the planet Mercury also called 'mearcair'?

The planet is usually written with a capital, Mearcair, while the metal is mearcair in lowercase.

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