Glossary

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Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

  • First click on the letters of the alphabet to browse for terms.
  • Select a subject from the drop-down menu above to filter the terms by Subject.
  • Or lastly, type the term you are looking for into the search box.

EXAMPLES

Here are some examples of the kinds of definitions you’ll find on this page.

nickel-cadmium chemical cell.

nickel-metal hydride cell.

convert nitrites into nitrates or ammonium ions into nitrites.

the process by which nitrogen passes through the ecosystem.

the process during which nitrogen gas is converted into substances that can be used by plants,...

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