oxime UK /ˈɒk.siːm/US /ˈɑkˌsiːm/ noun1 •Any of a class of organic compounds, of general formula RR'C=NOH, derived from the condensation of an aldehyde (R' = H) or ketone with hydroxylamine.In contrast, a water-repellent substance, for example, fluoric resin or Teflon, is extremely nonaffinitive with the oily oxime hydrochlorides and has a nature to repel it. — 1969 formsoximes