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:

having similar parts regularly arranged around a central axis.

Subject:

sunlight

Subject:

emitting (or giving off) radiation energy, which is harmful to living organisms.

Subject:

(also called radioactive dating) a method of measuring the age of fossils based on how much...

Subject:

a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...

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