Chemistry is the science that tells us what things and people are made of; for example, that water is really H2O, two atoms of hydrogen and one of oxygen.

Chemistry deals with chemicals and elements, the building blocks of our world. The periodic table, that table of all of earth's basic elements — iron, carbon, oxygen, nitrogen, etc. — comes from chemistry. Chemistry explains how atoms attract each other to become molecules. We also use the term to refer to people who are attracted to each other, either as colleagues, friends or romantic partners. Movie reviewers often say that that romantic leads have "great chemistry" — or not.

Definitions of chemistry
  1. noun
    the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
    synonyms: chemical science
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    chemoimmunology, immunochemistry
    the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies)
    organic chemistry
    the chemistry of compounds containing carbon (originally defined as the chemistry of substances produced by living organisms but now extended to substances synthesized artificially)
    inorganic chemistry
    the chemistry of compounds that do not contain hydrocarbon radicals
    physical chemistry
    the branch of chemistry dealing with the physical properties of chemical substances
    branch of chemistry that deals with the chemical action of electricity and the production of electricity by chemical reactions
    the branch of chemistry that studies elementary (often very fast) chemical reactions as they occur; the experimental methods are often based on the use of femtosecond laser pulses
    the chemistry of the earth's crust
    branch of chemistry that deals with the chemical action of light
    nuclear chemistry, radiochemistry
    the chemistry of radioactive substances
    surface chemistry
    the branch of chemistry that studies processes occurring at interfaces between phases (especially those between liquid and gas)
    the branch of chemistry that studies the relation between chemical action and the amount of heat absorbed or generated
    the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry
    the branch of organic chemistry dealing with the chemistry of plants
    type of:
    natural science, science
    the sciences involved in the study of the physical world and its phenomena
  2. noun
    the chemical composition and properties of a substance or object
    “the chemistry of soil”
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    type of:
    the real physical matter of which a person or thing consists
  3. noun
    the way two individuals relate to each other
    “their chemistry was wrong from the beginning -- they hated each other”
    synonyms: alchemy, interpersonal chemistry
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    type of:
    social relation
    a relation between living organisms (especially between people)
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