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.

a group of organic compounds having a triple bond between two carbons.

two or more different forms or structures of the same element.

(also called allotropism) the property of some chemical elements to exist in two or more...

mixtures of different metals.

the nuclei of helium atoms: He2+

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