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.

[edit] Other organic chemical word components

-al -(CO)H -ane -C-C- -ase enzyme -ene -C=C- -oate -COOx or -COO-

-oic acid -COOH -ol -OH -one C=O -yl radical -yne -C≡C-

alk- any not aromatic ar- any aromatic aza- N instead of C thio- S (often instead of O)