ketide

In organic chemistry terms the difference between ketone and ketide

is that ketone is a homologous series of organic molecules whose functional group is an oxygen atom joined to a carbon atom—by a double bond—in a carbon-hydrogen based molecule while ketide is any organic compound containing adjacent methylene and carbonyl functional groups.

As a noun ketide is

(organic chemistry) any organic compound containing adjacent methylene and carbonyl functional groups.

As a verb betide

is to happen to.

As a noun ketide is

(organic chemistry) any organic compound containing adjacent methylene and carbonyl functional groups.