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:

contraction of the cardiac muscle.

tar
Subject:

a black substance that coats the lungs of a smoker, causing cancer of the respiratory tract.

Subject:

a group or category in the biological classification system (the plural of taxon is taxa).

Subject:

the practice and science of classification. This is the part of systematics that is only...

Subject:

(also called lithospheric plates) massive, irregularly shaped slabs of solid rock.

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