As an adjective unsaturated
is (chemistry|of a solution) not saturated; capable of dissolving more of a solute at the same temperature.
As a noun olefine is
(chemistry, of a solution) Not saturated; capable of dissolving more of a solute at the same temperature.
(chemistry) Of a compound containing atoms sharing more than one valence bond, especially of an organic compound having one or more double bonds or triple bonds between carbon atoms.
(of a colour) Not chromatically pure; diluted.
(chemistry) olefiant gas, or ethylene
(chemistry, by extension) any of the series of unsaturated hydrocarbons of which ethylene is a type