About Chemistry Dictionary

Chemistry Dictionary is an online reference that explains chemistry terms in plain, accurate language. Whether you are a student meeting a word for the first time, a teacher looking for a clear way to phrase an idea, or simply curious, our goal is to give you a definition you can actually understand, and trust.

What you'll find

Every entry is built the same way, so you always know where to look:

• An answer-first definition, the meaning of the term in the first sentence.
• More detail, how it works and why it matters.
• An example, a concrete, everyday illustration.
• Key facts, formulas, symbols, units, and other at-a-glance information.
• Common questions, short answers to the things people ask most.

Terms are grouped into the main branches of chemistry, general, organic, inorganic, physical, analytical, and biochemistry, and cross-linked so you can follow an idea from one entry to the next.

How our definitions are written

Accuracy comes first. Definitions are written in clear language and checked against established chemistry before they are published. We favor the standard conventions used in classrooms and textbooks (including IUPAC naming where relevant) and we keep explanations focused on what actually helps you understand the idea.

Our editorial team

Chemistry Dictionary is produced by a small editorial team of chemistry writers and reviewers. Every entry is written in plain language and then checked for accuracy against authoritative sources before it is published. Compound formulas and identifiers are verified against PubChem, element data follows the IUPAC periodic table and the Royal Society of Chemistry, and physical constants are checked against the NIST Chemistry WebBook. You can see the full list on our sources and editorial standards page.

Every term page shows when it was last reviewed. We update entries as conventions change and whenever a reader points out something we can make clearer or more accurate.

Corrections and feedback

Chemistry is a big subject and we would rather be corrected than be wrong. If you spot an error, an unclear explanation, or a term you think we should add, please get in touch, we read every message and update entries when needed.