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:

group of similar organisms that can breed with each other to produce fertile offspring. It is...

Subject:

all the different living organisms on the Earth from the smallest micro-organisms to the largest...

Subject:

a ring of muscle that controls the passage of substances through a tube or body opening.

Subject:

a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...

Subject:

the instrument that measures the volume of air entering and leaving the lungs.

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