combining form
or keto-
Etymology: International Scientific Vocabulary, from ketone
1. usually keto-
a. : containing the ketone group
keto hexose
— in names of clases of compounds; compare ald- 1
b. : containing a ketone group regarded as formed by replacement of two hydrogen atoms in a methylene group by oxygen — in names of specific organic compounds
keto propionic acid
— compare ox-
c. usually italic : containing an unmodified ketone group — in names of open-chain ketonic forms of specific sugars
keto- d -fructose
— compare aldehydo- 1
2. : related to a ketone
ket oxime
— compare ald- 2