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