Aliphatic

pertaining to nonaromatic hydrocarbon compounds in which the constituent carbon atoms can be straight-chain, branched chain, or cyclic, as in compounds; saturated, as in the paraffins; or unsaturated, as in the olefins and alkynes.
Historical Examples

Carbohydrates are classed as open-chain compounds, that is, they may be regarded as derivatives of the aliphatic hydrocarbons.
The Chemistry of Plant Life Roscoe Wilfred Thatcher

As before, only true ring nuclei, and not internal anhydrides of aliphatic compounds, will be mentioned.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various

They are compounds which greatly resemble the mixed ethers of the aliphatic series.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3 Various

The azo-group is particularly active, both the aliphatic and aromatic compounds being coloured.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various

These observations may be summarized by saying that the benzene nucleus is more negative in character than the aliphatic residues.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various

What are commonly known as “fruity” odors belong mostly to what the chemist calls the fatty or aliphatic series.
Creative Chemistry Edwin E. Slosson

adjective
(of an organic compound) not aromatic, esp having an open chain structure, such as alkanes, alkenes, and alkynes

aliphatic al·i·phat·ic (āl’ə-fāt’ĭk)
adj.
Of, relating to, or being a group of organic chemical compounds in which the carbon atoms are linked in open chains.
aliphatic
(āl’ə-fāt’ĭk)

Relating to organic compounds whose carbon atoms are linked in open chains, either straight or branched, rather than containing a benzene ring. Alkanes, alkenes, and alkynes are aliphatic compounds. Compare aromatic.