Find Definitions

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.


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

Select a subject
Search for a definition...

causing the opposite effect.


muscles that work in pairs and are responsible for causing movement in opposite directions in...


the male organ of the plant where the pollen grains are formed.


potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...


substance that destroys bacteria.