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ammonia

B2
Fairly common

Pronunciation

UK

  • /æmˈəʊniə/

US

  • /əˈmoʊnjə/

Meanings

Noun

  1. a pungent colorless gas and chemical compound, NH3, used in fertilizers, cleaners, and industrial processes

Beyond the definition

Ammonia isn't just that stinging smell you associate with cleaning supplies! It's a naturally occurring compound made of nitrogen and hydrogen. Think of it as a building block for many things—from fertilizers that help plants grow, to refrigerants used in cooling systems, to some household cleaners (usually as ammonia dissolved in water).

You might have smelled ammonia when cleaning windows (though be careful—it’s strong stuff!). But it’s also produced as organic matter breaks down, so you can sometimes catch a whiff near farms, animal housing, or compost heaps. In fact, the word “ammonia” is linked to “sal ammoniac,” a pungent salt historically collected near a temple of the god Ammon (Amun). It has a very distinct smell and is often described as sharp or biting.

Examples

  1. 1

    Cleaning products

    Many glass cleaners contain ammonia.

  2. 2

    Chemical smell

    The bathroom still smelled of ammonia after we finished cleaning it.

  3. 3

    Safety warning

    Never mix bleach and ammonia, because the gas can be dangerous.

See also

Similar

  • azane

Shades of meaning

  • ammonium hydroxide

Contrast

Used with (collocations)

  • household ammonia
  • anhydrous ammonia
  • ammonia smell
  • ammonia fumes

Word family

  • ammoniacal

Explore

Forms and spellings

1 form open this card.

Main spelling

  • ammonianoun