chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions

natural phenomenon - all non-artificial phenomena

allotropism, allotropy - the phenomenon of an element existing in two or more physical forms

exchange - chemical process in which one atom or ion or group changes places with another

crystallisation, crystallization, crystallizing - the formation of crystals

valency - the phenomenon of forming chemical bonds

fermentation, ferment - a chemical phenomenon in which an organic molecule splits into simpler substances

pleomorphism, polymorphism - (chemistry) the existence of different kinds of crystal of the same chemical compound

state of matter, state - (chemistry) the three traditional states of matter are solids (fixed shape and volume) and liquids (fixed volume and shaped by the container) and gases (filling the container); "the solid state of water is called ice"