-ine \-ine\ ?; 104.
   1. chem. a suffix, indicating that those substances of
      whose names it is a part are basic, in their nature, i.e.
      contain a basic nitrogen group.
      1913 webster +pjc

   note: all organic bases, and basic substances especially
         nitrogenous substances, are systematically written
         with the termination -ine; as, quinine, pyridine,
         morphine, guanidine, etc. certain substances containing
         nitrogen though with net neutral character as certain
         amino acids also end in -ine, such valine and glycine.
         all indifferent and neutral substances, as proteids,
         glycerides, glucosides, etc., should commonly be
         spelled with -in; as, gelatin, amygdalin, etc. this
         rule has no application to those numerous commercial or
         popular names with the termination -ine; as, gasoline,
         vaseline, etc.
         1913 webster +pjc

   2. organ. chem. a suffix, formerly used to indicate
      hydrocarbons of the second degree of unsaturation; i. e.,
      members of the acetyline series; as, hexine, heptine,
      etc., but now superseded by the ending -yne, as in
      propyne.
      1913 webster +pjc
see also:
-yne