What does aliphatic mean?
The definition of aliphatic
Al`i*phat”ic, a. [Gr. , , oil, fat.] (Org. Chem.)
Of, pertaining to, or derived from, fat; fatty; — applied to compounds having an openc-hain structure. The aliphatic compounds thus include not only the fatty acids and other derivatives of the paraffin hydrocarbons, but also unsaturated compounds, as the ethylene and acetylene series.