Alk-

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The root alk- is used in organic chemistry to form classification names for classes of organic compounds which contain a carbon skeleton but no aromatic rings. It was extracted from the word alcohol by removing the -ol suffix. See e.g. alkyl, alkane.

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Organic Chemistry Affixes
Carbon-based
-ane (alkane) · -ene (alkene) · -ine (unsaturated hydrocarbon) · -yne (alkyne) · alk- (saturated hydrocarbon) · ar- (aromatic)
Oxygen-based
Nitrogen-based
-ine (alkaloid) · aza- (N replaces C)
Sulfur-based
thio- (extra S)
Other
-ase (enzyme)  · -yl (radical) · nor- (no residues)
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