aliphatic

Of, pertaining to, or derived from, fat; fatty; -- applied to compounds having an openc-hain structure. The <i>aliphatic</i> compounds thus include not only the <i>fatty</i> acids and other derivatives of the paraffin hydrocarbons, but also unsaturated compounds, as the ethylene and acetylene series.

adjective

Source: webster1913

having carbon atoms linked in open chains

adj.all

Source: WordNet 3.0