- chemistry, chemical science - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
--1 is a kind of natural science
--1 has particulars:immunochemistry, chemoimmunology; organic chemistry; inorganic chemistry; physical chemistry; electrochemistry; femtochemistry; geochemistry; photochemistry; radiochemistry, nuclear chemistry - chemistry, interpersonal chemistry, alchemy - the way two individuals relate to each other; "their chemistry was wrong from the beginning
--2 is a kind of social relation