“+ adjective
: not saturated: as
a. : capable of absorbing or dissolving to a greater degree
an unsaturated salt solution
b. of a chemical compound or mixture : able to form addition products — used especially of organic compounds containing double or triple bonds between carbon atoms
ethylene, acetylene, and oleic acid are unsaturated compounds
hydrogenation of unsaturated vegetable and marine oils — O.B.J.Fraser
c. : relating to minerals (as nepheline and leucite) that generally do not form in the same rock with quartz