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.
when an organic compound contains a double or triple bond and thus the maximum number of...
a white crystalline organic compound used as a fertilizer, in medicine and in resins.
the electrons in the outermost occupied shell of an atom.