aliphatic

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aliphatic

(of an organic compound) not aromatic, esp having an open chain structure, such as alkanes, alkenes, and alkynes
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

aliphatic

[¦al·ə¦fad·ik]
(organic chemistry)
Of or pertaining to any organic compound of hydrogen and carbon characterized by a straight chain of the carbon atoms; three subgroups of such compounds are alkanes, alkenes, and alkynes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.