(chemistry) Oxygen. / (organic chemistry) Having a methylene group replaced by a carbonyl group.

(chemistry, in combination) A substituent oxygen atom connected to another atom by a double bond / the game noughts and crosses

(Cockney rhyming slang) The London Underground rail network.

(Ireland) Everything is satisfactory; things are fine.

(UK, slang, humorous) Of sexual intercourse: anally.

(chemistry) Any oxohalide in which the halide is bromide

(organic chemistry) A saturated eight-membered heterocycle having seven carbon atoms and one oxygen atom

(organic chemistry) glyoxylic

plural of oxobromide

(organic chemistry) Any organic compound containing only atoms of carbon and oxygen