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.

Subject:

reactions in which large complex molecules are broken down to form smaller,simpler molecules;...

Subject:

a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy,...

the use of a catalyst to bring about the cracking of mineral oils that boil at high temperatures...

Subject:

area that supplies water to a river system

a term meaning purgation or purification. Aristotle claimed that the audience of a tragedy...

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